OPINION OF THE COURT
Murphy, P. J.
After having been adjudged guilty in an administrative proceeding of possessing stolen property and of failing to take proper police action when he became aware that officers under his command had removed property from the scene of a past burglary, Sergeant Richard D. Farry, petitioner herein, was dismissed from the police force. We are now called upon to determine whether the administrative findings of guilt upon which petitioner’s dismissal was based are supported by substantial evidence as they must be to pass judicial muster pursuant to CPLR 7803 (4).
The source of the allegations against petitioner, as well as the testimony implicating him in the charged misconduct, was an officer named Thomas Peteroy. Peteroy testified as follows: At 4:46 on the morning of January 24, 1981, he and his partner, Officer Gillott, received a radio transmission from Sergeant Grice. Grice requested that Sergeant 2 (Farry) provide him with backup at the scene of a burglary which had occurred at the Rosenstock Oldsmobile dealership garage, located at 440 West 19th Street in Manhattan. Peteroy and Gillott responded at once. They drove in their patrol car from 18th Street and 9th Avenue where they received the radio transmission, to the nearby garage in a matter of minutes, arriving no later than 4:50 a.m. There they found Sergeant Farry and his driver, Officer Pizzo, waiting for them. Sergeant Grice, whose request for backup prompted their presence at Rosenstock was not there, and he played no part in the ensuing events. The four officers, leaving their patrol cars unattended in the street, proceeded to search the Rosenstock premises for burglars, starting with the second floor. They found that it had been thoroughly ransacked; windshields of the cars parked there had been shattered, dashboards vandalized and radios removed. After surveying the damage for about 10 minutes, the officers went downstairs. On reaching the street, Peteroy and Pizzo encountered a man who reported [9]*9that he resided nearby and had heard a disturbance coming from the roof of the Rosenstock premises at about 1:30 that morning. When their conversation with this man ended, Peteroy and Pizzo joined Parry and Gillott in the lower level service area and, together, the officers resumed their search. Finding no burglars in the service area, they entered the cashier’s office. Again, no burglars were found but evidence of their intrusion was not wanting. Drawers and file cabinets had been opened and their contents strewn everywhere. Papers and human excrement covered the floor. The officers then entered the parts department through an unlocked door connecting it with the office area. No burglars were found there either. Their search of the downstairs thus concluded after between 10 and 15 minutes, the officers, while still in the parts department, conferred as to which parts they could use. They then started moving the items they had decided to take from the parts department to the service area. Sometime during this process, petitioner telephoned the precinct but, nevertheless, had time to help his companions transport some batteries and cases of oil. Once the officers had stacked eight batteries, several cases of oil, and varying unspecified quantities of oil filters, air filters, antifreeze, spark plugs and ratchets just outside the office in the service area, Peteroy and Gillott unlocked and opened the garage door and Pizzo backed Sergeant Parry’s patrol car into the service area so that the merchandise could be loaded conveniently into its trunk. After the trunk was loaded, Peteroy and Gillott moved a car from the second floor and placed it up against a swinging garage door on the first floor to keep it closed securely. On their way back to the service area, Peteroy and Gillott encountered an employee of ADT Security Systems, who had just arrived on the scene. ADT installed, maintained and monitored the burglar alarms on the Rosenstock premises. The police left shortly after the ADT employee’s arrival and went to a lot where the stolen merchandise was placed in Officer Gillott’s van. Subsequently, the officers met, divided the items and transferred them to their private vehicles. Peteroy later sold a number of the stolen batteries to customers at the gas station where he moonlighted. He transferred the sale proceeds to his fellow officers, including petitioner.
The Assistant Commissioner of Trials (ACT) credited the foregoing account and on that basis, found petitioner guilty of the charged misconduct. Of course, as our dissenting colleague notes, it is the special province of the trier of fact to weigh a [10]*10witness’ testimony and determine whether it is to be credited. This is because the trial court is uniquely positioned to observe the witness and thereby to assess his or her capacity for truth-telling. There are cases, however, where the trier of fact is not free to base its ultimate determination solely on testimony it might find believable. Thus, in a criminal prosecution, the testimony of an accomplice is not a sufficient basis for a conviction; the accomplice’s allegations of wrongdoing must be corroborated (CPL 60.22; People v Hudson, 51 NY2d 233, 238). As we have elsewhere noted (Matter of Bernhaus v Ward, 118 AD2d 196), although the corroboration requirement is not generally applicable in administrative proceedings which are deemed civil in nature, there are, nevertheless, circumstances where inculpatory testimony given in an administrative forum must be corroborated (supra, at p 201; see also, Matter of Evans v Monaghan, 306 NY 312, 319-320; Matter of Kelly v Murphy, 20 NY2d 205, 208). The need for corroboration in such circumstances stems from the need for substantial evidence, aptly described as "proof sufficient to satisfy a reasonable man, of all the facts necessary to be proved in order to authorize the determination”. (Matter of Weber v Town of Cheektowaga, 284 NY 377, 380.) Put somewhat differently, the record as a whole must contain reliable evidence sufficient to warrant judicial confidence in the essential soundness of the administrative determination. (See, Matter of Evans v Monaghan, supra, at pp 319-320; Matter of Kelly v Murphy, supra, at p 208; Matter of Bernhaus v Ward, supra, at p 201.)
We do not propose to delineate strictly those limited circumstances in which some measure of corroborative evidence must be adduced in administrative proceedings. Where, however, the charged misconduct is criminal in nature and the inculpatory testimony has as its source one who, in addition to holding himself out as an accomplice, possesses a clear motive to fabricate and a history of dishonest behavior raising the most serious questions as to his veracity or capacity therefor, the inherent danger of contrived testimony is too great to be countenanced. Exclusive reliance upon such testimony entails a risk of injustice which cannot be responsibly, or for that matter legally, entertained.
Our examination of the record in this matter persuades us that Officer Peteroy’s substantially uncorroborated testimony did not provide a sufficient evidentiary basis for the determination under review. Moreover, considering the circumstances [11]*11under which Peteroy’s testimony came to be offered, a high degree of corroboration was necessary. We are not of the view, apparently held by the dissenter, that there is any evidence in the record corroborative of Peteroy’s allegations as to petitioner’s misconduct. But, assuming, arguendo, that there is, it is not sufficient to command our confidence in the soundness of the determination at issue.
By all accounts, including his own, Peteroy was a "rogue cop”. The following partial recapitulation of his all-encompassing dishonesty is uncontroverted in the record before us. Just two months after joining the police force in 1968, Peteroy began systematically to abuse his position of trust as a police officer to indulge in what can only be characterized as a career of thievery. On occasions too numerous to specify, but estimated by Peteroy at between two and three hundred, he stole money and property from the scenes of past burglaries to which he responded in his capacity as a police officer assigned to the 10th Precinct. During his testimony he noted but a few more recent examples of such conduct: in June 1979, Peteroy stole $1,000 from a camera store; in December 1980, he and his partner Gillott stole $1,000 from a pizzeria; also in December 1980, Peteroy burglarized a laundromat from which he took $200 and a private house from which he took silver coins whose worth he valued at $300; on January 31, 1981, Peteroy returned to the Rosenstock dealership (it will be recalled that the incident in connection with which petitioner is charged, allegedly occurred one week before on January 24, 1981) and stole automobile inspection stickers and stamps; in July 1981, Peteroy stole drugs and watches from a pharmacy; and in November and December 1981, respectively, Peteroy burglarized a Chinese vegetable store and a souvlaki stand.
Peteroy, by his own admission, was a compulsive gambler. In 1974, considerably before his betting activities reached their height, Peteroy was suspended for 10 days for being away from his post on some 40 occasions, mostly to engage in betting transactions. Although his thievery antedates his heaviest gambling, there can be little doubt that Peteroy’s apparently insatiable need for cash, and with it his propensity for thievery, was largely fueled by his mounting gambling debts. At the peak of his gambling activity in 1978, Peteroy bet as much as $4,000 a week with bookmakers and had debts of over $30,000. He borrowed extensively both from legal lenders and loan sharks and his larcenous agenda became more ambitious, extending to off-duty burglaries. It was dur[12]*12ing this period of heavy gambling indebtedness that Peteroy stole $1,400 from his off-duty employer, Rival Foods. Rival thereafter filed a complaint with the police department. When questioned by departmental investigative authorities Peteroy lied, denying his commission of the theft. He then sought psychiatric help, but not because he saw anything wrong with his behavior. As he put it, "I went to Psyche Services because I was in a jam, I didn’t go because I had a gambling habit.” Eventually, Peteroy received institutional treatment for compulsive gambling at a psychiatric center in Cleveland, Ohio. For a period afterward, he abstained from gambling, if not from thievery. His habit, however, revived in September 1980 and along with it, his need for still greater amounts of cash. In 1981, Peteroy, while off duty, burglarized a Porsche parts distributor and along with two other officers stole car radios with an estimated total value of $80,000.
It was during a gambling excursion to Atlantic City in June 1982 that Peteroy was finally arrested by the FBI. Since 1979 he had regularly received protection money from two "after hours” clubs in the 10th Precinct. For this practice, he was charged with violation of the Hobbs Act,1 a Federal felony carrying a maximum prison sentence of 20 years. Shortly after his arrest Peteroy entered into an agreement with the prosecuting authorities. In exchange for his cooperation in the prosecution of other officers suspected of corrupt activity, Peteroy was to be allowed to plead guilty to a lesser offense. He was also promised that, as he put it, his "level of cooperation” with Federal, State and departmental prosecutors would be brought to the attention of the court at the time he was sentenced for the crime to which he entered his guilty plea.
Following the cooperation agreement, Peteroy began a period of involvement with the United States Attorney and the office of the Special Prosecutor. In January 1983, he was placed on "modified assignment” in the Manhattan Property Clerk’s office with the understanding that he would be available to testify in Federal, State and departmental proceedings. In April of the same year, he was permitted to, and did, enter a plea of guilty to conspiracy to violate the Hobbs Act, a felony, but one which in contrast to the crime with which he [13]*13was initially charged, carried a maximum prison term of only five years. His conviction for a Federal felony thus established, Peteroy nevertheless was allowed to continue his employment as a police officer on "modified assignment” in plain contravention of Public Officers Law § 30 (1) (e) mandating the removal of public officers by operation of law upon conviction of a felony.2
About one month after his plea, Peteroy, still on "modified assignment”, was debriefed by Detective Bertolino of the department Internal Affairs Division. Bertolino showed Peteroy a roster of 10th Precinct personnel, pointed to certain names, including petitioner’s, and asked whether Peteroy had any disclosures to make concerning the officers indicated. It was then that Peteroy first made his allegations concerning petitioner’s involvement in the subject burglary at Rosenstock. Bertolino destroyed his notes of the debriefing and testified that his subsequent reconstruction of Peteroy’s account was inaccurate.3 In any case, it is clear that Peteroy’s initial recollection of the events at issue, said to have occurred some 2 Vi years before and concerning which he made no entries in his police memo book, was not altogether sharp. It is undisputed that in the months before petitioner’s trial, while he was assigned to the Internal Affairs Division, Peteroy’s memory was refreshed on certain points. Police reports of the numerous burglaries which occurred at Rosenstock were used to help Peteroy remember the date of the incident. To help him recall the time and the source of the call for backup at Rosenstock, he was shown a police department computer [14]*14printout, known as a Sprint report, along with a written interpretation thereof by a department employee. His memory was refreshed as to the time the ADT employee arrived at the Rosenstock premises by the Department Advocate.
Petitioner was formally charged in November 1983 and his departmental trial took place in January 1984. At the time of the trial, Peteroy was still awaiting sentencing. He remained on "modified assignment” with the Internal Affairs Division, collecting a regular biweekly paycheck for rendering no other conceivable service than that of providing information and testimony concerning the misconduct of other officers.
In light of the foregoing, it should be clear why we consider corroboration of Peteroy’s testimony essential to the legal sufficiency of the proof in this case. Here, we deal with a demonstrably corrupt and weak-willed individual, who on innumerable occasions during his some 16 years as a police officer, committed crimes whose victims were those he was sworn to protect. Repeatedly, Peteroy showed himself to be wholly unaffected by legal and ethical concerns or by any sense of fidelity to his duty as a police officer. He was governed instead by what can only be characterized as unreflective, and pathologically informed greed. A less trustworthy source can hardly be imagined, particularly in the circumstances here obtaining. At a time when Peteroy stood convicted of a felony and faced the possibility of a five-year prison term, he was asked specifically if he had any allegations of wrongdoing to make concerning petitioner. As noted, Peteroy was then under the impression that his “level of cooperation” would be brought to the attention of the sentencing Judge. He also could not have failed to understand that there was some relation between his usefulness to the Internal Affairs Division and his receipt of a biweekly paycheck. The possibility that Peteroy would purport to increase his "level of cooperation” by falsely accusing and testifying against another officer does not seem at all remote in these circumstances. His allegations of misconduct had, therefore, to be substantiated with the utmost care.
The dissent characterizes our concern as "exaggerated”. It notes that Peteroy had no discernable grievance against petitioner and that Peteroy’s extensive fund of "valid information” regarding the wrongdoing of other officers made it improbable that he would incur the risks entailed by fabrication. It is true that there is no indication in the record of any enmity between Peteroy and petitioner (contrast, Matter of [15]*15Bernhaus v Ward, 118 AD2d, at p 203). But the existence of a grievance is only one factor to be weighed in assessing the need for corroboration. Where, as here, there are other potent factors enhancing the likelihood of perjured testimony, a specific grievance to motivate the falsehood is not essential. In this connection, we observe that insofar as can be gathered from the record, Peteroy’s recurrent resort to dishonesty was not in the main a product of personal animosity, but simply a means to a desired end. Peteroy had no identifiable dispute with those he stole from or lied to; for the most part, he took his victims as he found them.
It is, of course, true that it would have been imprudent for Peteroy to give false information and thereby risk increased penalties. Peteroy, however, was not a prudent man. He was a gambler who, always sure of his ability to "beat the odds” squandered large sums of money and ultimately his career and reputation. We have little difficulty believing that Peteroy would gamble on benefiting from a dishonest act or falsehood, giving little real heed to the possibility that he might be found out. That is, in fact, what he did over and over during his 16 years as a police officer. His willingness to entertain the most foolhardy risks was not diminished by his arrest.
Indeed, Peteroy admitted lying to Federal and State prosecuting authorities on several occasions even after his "cooperation” agreement. Incredibly, he also continued to receive protection money, the very activity for which he was arrested and eventually convicted. His confidence in his ability to manipulate and deceive was obviously immense and interfered in the most palpable way with any exercise of good judgment.
The dissent’s observation that Peteroy had no reason to fabricate concerning petitioner since he had a wealth of "valid information” concerning criminal activity of many other officers, proceeds from a premise that finds little support in the record. We simply do not know what valid information Peteroy possessed about other officers. The record indicates that he testified in numerous proceedings, but the validity of the information provided by him is, on the present record, a matter for sheer speculation. Moreover, the actual number of officers Peteroy was in a position to implicate may have been far smaller than the number of burglaries and other crimes to which he admitted. Of the crimes specifically described by him, several were committed unassisted. In addition, to the extent that he acted with others, it is probable that he had a regular group of companions whose number was far less than [16]*16that suggested in the dissenting opinion. Finally, Peteroy withheld information and lied concerning the criminal involvement of those officers toward whom he felt some peculiar sense of loyalty; the very same officers who were apparently most deeply involved with him in illicit activity. Thus, Peteroy initially lied to protect his regular partner, Gillott. He also failed to disclose the participation of two officers in the above-discussed Porsche burglary, thereby allowing them to retire from the police department on their regular pensions. Obviously, Peteroy felt no such loyalty toward petitioner who, we gather, was not a regular companion of his.4 The point to be made is that the number of officers about whom Peteroy may have had valid information was, in all probability, not only far more limited than the dissenter suggests, but was further limited by Peteroy’s characteristic desire to manipulate circumstances to his satisfaction. Fabrication, we think, would have been perfectly acceptable to Peteroy as a device to advance his interests without jeopardizing those of his friends. It must be remembered that at the time Peteroy first mentioned petitioner’s supposed involvement in the Rosenstock burglary, he wholly failed to disclose the involvement of his partner Gillott. We note with interest that as Peteroy eventually admitted, he and Gillott were present at the Rosenstock premises several hours before the incident at issue, at about 1:30 a.m., on what Peteroy termed "some sort of job”. It is at about that time that the complaints received by the 10th Precinct and the reports of neighbors indicate that the original burglary at Rosenstock probably commenced.
Having made these observations, it is important to understand that we do not thereby conclude that Peteroy in fact lied concerning petitioner. What we do conclude is that there existed a sufficiently strong possibility of fabrication to trigger the need for corroboration as a matter of law. To his credit, the ACT understood that Peteroy’s account required some substantiation, for he cited evidence which he felt supplied the necessary corroborative support. This evidence, however, was not, as might be expected, in the form of testimony from other witnesses to the alleged wrongdoing. We are given no clue as to why Officers Pizzo and Gillott who, as far as can be discerned from the record, were not charged in connection with the subject incident, were not called by the department [17]*17to testify. Rather, the evidence consisted of documents, and testimony from ADT employees Samuel Siegal and Francis Canavan, and from the owner of the burglarized dealership, Herbert Rosenstock. The combined testimony of these witnesses, along with supporting documentation, established that a burglary had in fact occurred at the automobile dealership sometime during the night of January 24, 1981; that among the items missing as a result of the burglary were parts taken from the dealership’s parts department; and that the only alarm received from the Rosenstock premises by ADT during the night in question, emanated from the parts department at 5:00 a.m. From this, the ACT concluded that since the police were the only ones on the premises at 5:00 a.m., they must have triggered the alarm. This much is undisputed. The ACT, however, went further. He reasoned that since the only alarm received from the parts department went off at 5:00 a.m. that that was when the theft of the items from that area must have occurred, and that since only the police were present at that time, they must have committed the theft. This is perhaps a superficially appealing line of inferences, but it is not sustainable upon the record as a whole, much less is it "compelling” as the dissenter maintains.
The crucial question is not whether the parts department burglar alarm functioned at 5:00 a.m., but whether it was functioning until that point. If it was not, the parts department might have been burglarized undetected by the original burglars before 5:00 a.m. and the inference of wrongdoing which the ACT drew from the 5:00 a.m. alarm would be deprived of much, if not all, of its force. Ordinarily, one might infer that an alarm which functioned on one occasion would have functioned on a reasonably proximate earlier occasion if it had been triggered. That inference, however, is not a sound one given the peculiar circumstances with which we are here presented.
The testimony of the ADT employees indicated that the Rosenstock premises had two alarm systems: a perimeter system covering the outer doors and an interior series system covering the cashier’s office and the parts department. It is undisputed that on the night in question, the perimeter system was not functioning and that the alarm in the cashier’s office was out of order. ADT alarm installer Samuel Siegal, who responded to the 5:00 a.m. alarm and arrived at the Rosenstock premises at 5:18 a.m., testified that the only alarm which was "possibly” working was the alarm in the parts [18]*18department. Other testimony, apparently not considered by the ACT, indicated almost conclusively that the possibility that the parts department alarm functioned reliably prior to 5:00 a.m. was very slim indeed. This testimony indicated persuasively that the parts department had been previously entered and that no alarm was set off. The ACT inquired of Siegal "Do you remember what, if anything, you saw in the parts department?” Siegal replied, "I don’t recall. It looked like a bomb that is all” (emphasis added).5 As if oblivious to this response, the ACT inquired whether anything looked out of place! We are at a complete loss to understand how the police could have reduced the parts department to such a state of disorder in the time they had available to them. Far from corroborating Peteroy’s testimony, Siegal’s description of the total disarray he encountered in the parts department renders Peteroy’s inherently improbable account all but impossible.
It will be recalled that the police arrived at Rosenstock and commenced their search at 4:50 a.m. According to Peteroy, they searched the upstairs together for about 10 minutes. At this point, or at about 5:00 a.m., they went downstairs and, after a brief discussion with a bystander, searched the entire lower level for between 10 and 15 minutes. It was Peteroy’s testimony that only at this point, when they were sure they were alone on the premises, did the officers confer concerning which parts they could use. Thus, according to Peteroy, somewhere around 5:13, this being an extremely conservative estimate of the time, the officers started removing parts from the parts department and stacking them outside the door to the service area. We are not told how long this activity lasted, but are left with the impression that it must have taken several minutes because numerous items were transported and, as Peteroy indicated, petitioner had time to make a phone call while the others worked and then to help them by carrying a few cases of oil and some car batteries. Only after this was done was Pizzo sent to back the patrol car into the service area where the merchandise was loaded into the trunk. And only after the trunk was loaded did Peteroy and Gillott secure the garage door with a car from the second [19]*19floor. Returning from this task, they encountered Siegal who, in Peteroy’s words, had "just arrived on the scene”. All concerned agree that Siegal arrived at 5:18 a.m. Even if we take the most indulgent view of Peteroy’s testimony, making liberal allowances for imprecision in consideration of the fact that the testimony was given three years after the events alleged, we are completely unable to reconcile his account with the supposedly corroborative testimony supplied by Siegal.
If Peteroy’s testimony is to be credited, the officers did not even begin to remove items from the parts department until, at the very earliest, between 5:10 and 5:15 a.m. Yet, Peteroy also testified that the theft was a fait accompli by the time of Siegal’s arrival which indisputably occurred at 5:18. Even if we deduct substantially from the time Peteroy indicated was spent searching the premises, the officers would have been left a mere few minutes in which to confer, remove the items from the parts department, back the patrol car into the premises, load the trunk and secure the garage door. The difficulty involved in reconciling all this activity, which according to Peteroy occurred in sequence, with the exceedingly narrow time frame within which Peteroy testified it occurred, becomes nearly insuperable when two of Siegal’s observations are taken into account. First, Siegal stated that upon his arrival, the patrol car was parked with its front end facing the parts department.6 Thus, if it is true that, as Peteroy testified, the car was backed into the service area for convenient loading, the car would have had to have been turned around before Siegal appeared. This, however, adds yet another time consuming activity to those the officers supposedly accomplished in the very few minutes they had. Of substantially greater consequence, however, was Siegal’s second observation, namely, that the parts department looked as if it had been the scene of a bomb explosion. To everything else the officers are said to have done in the time Peteroy’s testimony indicated was available to them, we must then add their reduction of what the testimony of Herbert Rosenstock would lead us to believe was an orderly and well inventoried parts department, to a state of total disarray. The only alternative to this highly implausible conclusion is that the parts department was ransacked by the original burglars before the police arrived in [20]*20the same manner as they ransacked all the other areas of the dealership. Indeed, it is utterly incomprehensible that burglars would break into an automobile dealership and ransack all its areas except the one probably containing the most valuable merchandise. This is especially true in light of the fact that, as Peteroy testified, the parts department door was left unlocked. Moreover, as Peteroy expressly observed in answering a question posed by the Department Advocate, the original burglars stole many parts:
"Walsh [Department Advocate]: Officer, do you know what other property was stolen during the course of that burglary by the burglars?
"Peteroy: I don’t know specifically. I know it was a large amount of parts, a couple of cars” (emphasis added). Presumably, the parts came from the parts department.
When we consider the record as a whole, the inference that the ACT drew from the 5:00 a.m. alarm seems almost entirely insupiportable. We deal with an alarm system about which the most that can be said is that one of its components was possibly functioning. We note that the record shows that the Rosenstock premises were burglarized repeatedly both before and after the subject break-in of January 24, and that the alarm system was apparently ineffective on those occasions as well. On at least one such occasion, January 31, 1981, one week after the events in question, parts were once again successfully removed from the parts department. In addition to this general evidence of the alarm system’s unreliability, we have noted the testimony of both Siegal and Peteroy indicating that the parts department was in fact entered and ransacked by the original burglars on January 24, 1981 and that the alarm system failed to give notice of their intrusion. We will not sanction the destruction of a man’s career on the off chance that a temperamental alarm system was continuously functioning until 5:00 a.m. on the morning of January 24, 1981. At most, the testimony of the ADT personnel and Herbert Rosenstock establishes that a burglary occurred, and that the parts department was entered by the police at 5:00 a.m., as well it might have been during a routine search of the premises. This testimony cannot be fairly construed to corroborate Peteroy’s allegations as to petitioner’s wrongdoing. To the contrary, as we have observed, Siegal’s testimony significantly undermines Peteroy’s account of the theft.
The other supposedly corroborative evidence cited by the [21]*21ACT was the above-mentioned Sprint report said to indicate that Sergeant Grice (Sergeant 1), and not petitioner (Sergeant 2), initiated the call for backup at the Rosenstock premises. This bit of evidence does not prove or corroborate anything concerning the charged wrongdoing, nor does it even demonstrate the accuracy of Peteroy’s recollection. Peteroy was shown the Sprint report and an interpretation of it by a departmental technician shortly before he testified. It is hardly surprising then that his memory, thus "refreshed”, would agree with the interpretation of the report furnished by the departmental technician in his trial testimony. More to the point is whether Peteroy remembered anything at all. The official 10th Precinct roll call showed that Grice, who supposedly issued the 4:46 a.m. call for assistance at Rosenstock, was on his meal break from 4:00 until 5:00 a.m. He was never seen at the Rosenstock premises by Peteroy who claimed to have arrived there less than five minutes after receiving the radio message, or for that matter by anyone else. Grice was never called by the department to confirm whether he did in fact request assistance at Rosenstock at the time indicated in the Sprint report. Given the documentary evidence indicating that Grice was nowhere in the vicinity of the Rosenstock premises when the call went out, the impression we are left with is that Peteroy had little or no recollection of what caused him to proceed to the Rosenstock premises and simply repeated information he was given by the department before he testified. His recollection of the surrounding circumstances far from being "clear and consistent in all respects” as the dissenter suggests was altogether remarkable for its variability. For example:
"Scroope [counsel for petitioner]: Were you in fact, in front of the Fun House[7] [located at 526 West 26th Street] when you got this call (for back-up at Rosenstock)?
"Peteroy: That’s a good possibility. I don’t recall if we were.”
A moment later the following exchange occurred:
"Scroope: You remember where you were when you got the call?
"Peteroy: Yes, I do.
"Scroope: Where were you?
[22]*22"Peteroy: 18th Street and 9th Avenue.”
Peteroy’s recollection of the events attending his response to the radio call is further thrown into doubt by his prior inconsistent statement to Detective Bertolino (see, n 3, supra). Although Bertolino, after listening to Peteroy testify, took the witness stand to explain that his notes of Peteroy’s debriefing were mistaken, he, nevertheless, reiterated that, as his notes stated, Peteroy told him that he arrived at the dealership before petitioner. After Peteroy’s memory was "refreshed” he, of course, testified that it was petitioner who arrived first. When considered in light of the record as a whole, the so-called corroborative evidence leaves us with the unpleasant impression that Peteroy’s memory was not so much refreshed as it was reconstituted during his lengthy and illegal assignment to the Internal Affairs Division following his felony conviction.
Although the contrary conclusion may seem to follow from what we have said, the foregoing review of the testimony adduced at petitioner’s trial, was not undertaken to demonstrate that Peteroy was an incredible witness. Our more limited objective has been to show that the supposedly corroborative evidence did not in fact corroborate Peteroy’s account of petitioner’s wrongdoing. We do not here intend to supplant the proper function of the Hearing Officer and make ultimate credibility determinations. Hence, we do not say that petitioner testified truthfully or even that Peteroy testified untruthfully. All we hold is that given the circumstances under which Peteroy came to testify, his testimony required firm corroboration if there was to be a sufficient evidentiary basis for the determination. The absence of such corroborative support fatally undermined the determination, even if Peteroy may have seemed to testify truthfully. We reiterate that the circumstances under which substantial evidence will entail some measure of corroboration are very limited. The offense charged must involve criminality and the motive for fabrication on the part of the witness giving the incriminating testimony, must be clear. The critical determination is whether exclusive reliance upon certain incriminating testimony creates a substantial danger of injustice. This determination must be made upon the record as a whole, particularly as it bears on the circumstances under which the testimony came to be offered. The defect in the proceeding under review was not the ACT’s failure to appreciate, in principle, the importance of corroborative evidence but in his practical [23]*23failure to point to any such evidence sufficiently supportive of Peteroy’s testimony. It is on this basis that we find it necessary to annul the determination under review.
Accordingly, in this CPLR article 78 proceeding transferred to this court by order of the Supreme Court (Alfred M. Ascione, J.), entered March 27, 1985, the petition should be granted and the determination of the Police Commissioner, Benjamin Ward, dismissing petitioner Sergeant Richard D. Farry from the Police Department of the City of New York, effective September 24, 1984, should be annulled, without costs.