On Rehearing En Banc
FERREN, Associate Judge:
Appellant was adjudicated delinquent for distribution of phencyclidine (PCP) and marijuana, D.C.Code § 33-541(a) (1988). He contends the trial court erred in refusing to conduct a pretrial evidentiary hearing on his motion to suppress evidence of his showup identification by an undercover police officer. We agree. Under our supervisory power over the administration of criminal justice in the District of Columbia,1 we hold that every defendant is entitled to an evidentiary hearing on a motion to suppress a showup identification unless it clearly appears, from informal discovery that the defendant is seeking a hearing in bad faith. We therefore reverse the adjudication and remand for an evidentiary hearing on the motion to suppress.2
I.
Following an undercover purchase of marijuana laced with PCP on April 12, 1985, Officer Gerald Awkard radioed the location and description of the seller to two other officers of the Metropolitan Police Department. The description identified the seller as wearing a white T-shirt, dark blue sweat pants, and light blue tennis shoes. The two officers found appellant sitting on a car directly in front of his home. They detained appellant until Officer Awkard drove by and identified appellant as the person who had sold him the drugs about four minutes earlier. A search incident to arrest uncovered neither PCP nor the prerecorded funds used by Awkard to make the purchase.
In his pretrial motion to suppress Awk-ard’s identification testimony, appellant argued the showup identification was unduly suggestive and unreliable. Appellant alleged no unusual facts about his particular identification, however; rather, he argued that showup identification procedures are [726]*726inherently suggestive. At a pretrial hearing on the motion, appellant maintained he was entitled to an evidentiary hearing because only through cross-examination of the government’s witnesses could he discover additional facts which might support the motion to suppress.
The motions court denied appellant’s motion without an evidentiary hearing. In a written opinion supporting its ruling, the court first noted that it is common practice in this jurisdiction to hold a pretrial eviden-tiary hearing on a motion to suppress an identification. 113 Daily Wash.L.Rptr. 1445, 1451 (June 4, 1985). The court then emphasized, however, both the extreme unlikelihood of success for such motions and the strain on judicial resources caused by evidentiary hearings. Id. The court relied substantially on Watkins v. Sowders, 449 U.S. 341, 101 S.Ct. 654, 66 L.Ed.2d 549 (1981), in which the Supreme Court held that the due process clause does not require a hearing out of the jury’s presence whenever a defendant claims an identification was obtained improperly. 113 Daily Wash.L.Rptr. at 1451. While the court acknowledged that showup identifications are inherently suggestive, it stressed the reliability of on-the-scene identifications by trained police officers and concluded that any suggestivity was not impermissible. Id. at 1451-52. The court added that appellant was not prejudiced from its denial of his motion without a hearing because appellant could attack the reliability of the identification at trial. Id. at 1452.
II.
In Jackson v. United States, 420 A.2d 1202 (D.C.1979) (en banc), we considered the question whether the fifth amendment requires an evidentiary hearing on a motion to suppress a lineup identification. We adopted the test established in Duddles v. United States, 399 A.2d 59 (D.C.1979), where we had concluded that, in order to justify a hearing on a fourth amendment suppression motion,
the defendant is obliged, in his [or her] definitive motion papers, to make factual allegations which, if established, would warrant relief (based on evidence discovered of the government and, if necessary, proffered from defendant’s own view of the case).
Jackson, 420 A.2d at 1206 (quoting Duddles, 399 A.2d at 63).
The government believes there is no relevant distinction between a showup identification and a lineup identification and, therefore, contends the Duddles-Jackson test should apply here — i.e., the defendant should have to make factual allegations warranting relief before an evidentiary hearing is required. We disagree. Dud-dles expressly premised its test on the availability to the defendant of evidence about the government’s actions “discovered [from] the government” or “proffered from the defendant’s own view of the case.” Id. In challenging a showup identification, however, a defendant has little access to the evidence necessary to make factual allegations warranting relief, in contrast with the typical lineup identification and fourth amendment seizure situations.
As Judge Newman noted in his dissent in this case at division:
At a lineup, the accused has a right to counsel, whose primary function is to observe the procedure so that facts indicating suggestivity and/or unreliability may be later proven at trial. [Citation omitted.] The accused is, in other words, privy to the facts which might form the basis of a challenge, and can allege them with some specificity in his motion papers.
In re F.G., 534 A.2d 297, 307 (D.C.1987) (Newman, J., dissenting). Such is the case also in most typical fourth amendment contexts. As Judge Newman explained:
An accused is present when an illegal arrest is made, when he or his environs are searched illegally, when a Miranda violation occurs, or when he is compelled to give a confession involuntarily. In addition, he may discover any warrant used by the police under Super.Ct. Crim.R. 16.
Id. at 307 n. 6. In this case, in contrast, F.G. had no right to counsel at the showup. Rather,
[h]e was detained at a street corner while an undercover police [officer] drove by in [727]*727an unmarked car and identified him. He could not see who was identifying him. He could not see how far away the identifying officer was, nor how fast the officer was driving when the identification was made; nor could he know if anything was obstructing the officer’s field of vision at the time of the identification.
Id. at 307. As a result, even if he had a meritorious claim, appellant would probably not be in a position — absent guaranteed, adequate discovery or an evidentiary hearing for which he could subpoena government witnesses — to make factual allegations which, if established, would warrant suppression of the showup identification.
In Clemons v. United States, 133 U.S.App.D.C. 27, 34, 408 F.2d 1230, 1237 (1968) (en banc), cert. denied, 394 U.S. 964, 89 S.Ct. 1318, 22 L.Ed.2d 567 (1969), the United States Court of Appeals for the District of Columbia Circuit stated:
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On Rehearing En Banc
FERREN, Associate Judge:
Appellant was adjudicated delinquent for distribution of phencyclidine (PCP) and marijuana, D.C.Code § 33-541(a) (1988). He contends the trial court erred in refusing to conduct a pretrial evidentiary hearing on his motion to suppress evidence of his showup identification by an undercover police officer. We agree. Under our supervisory power over the administration of criminal justice in the District of Columbia,1 we hold that every defendant is entitled to an evidentiary hearing on a motion to suppress a showup identification unless it clearly appears, from informal discovery that the defendant is seeking a hearing in bad faith. We therefore reverse the adjudication and remand for an evidentiary hearing on the motion to suppress.2
I.
Following an undercover purchase of marijuana laced with PCP on April 12, 1985, Officer Gerald Awkard radioed the location and description of the seller to two other officers of the Metropolitan Police Department. The description identified the seller as wearing a white T-shirt, dark blue sweat pants, and light blue tennis shoes. The two officers found appellant sitting on a car directly in front of his home. They detained appellant until Officer Awkard drove by and identified appellant as the person who had sold him the drugs about four minutes earlier. A search incident to arrest uncovered neither PCP nor the prerecorded funds used by Awkard to make the purchase.
In his pretrial motion to suppress Awk-ard’s identification testimony, appellant argued the showup identification was unduly suggestive and unreliable. Appellant alleged no unusual facts about his particular identification, however; rather, he argued that showup identification procedures are [726]*726inherently suggestive. At a pretrial hearing on the motion, appellant maintained he was entitled to an evidentiary hearing because only through cross-examination of the government’s witnesses could he discover additional facts which might support the motion to suppress.
The motions court denied appellant’s motion without an evidentiary hearing. In a written opinion supporting its ruling, the court first noted that it is common practice in this jurisdiction to hold a pretrial eviden-tiary hearing on a motion to suppress an identification. 113 Daily Wash.L.Rptr. 1445, 1451 (June 4, 1985). The court then emphasized, however, both the extreme unlikelihood of success for such motions and the strain on judicial resources caused by evidentiary hearings. Id. The court relied substantially on Watkins v. Sowders, 449 U.S. 341, 101 S.Ct. 654, 66 L.Ed.2d 549 (1981), in which the Supreme Court held that the due process clause does not require a hearing out of the jury’s presence whenever a defendant claims an identification was obtained improperly. 113 Daily Wash.L.Rptr. at 1451. While the court acknowledged that showup identifications are inherently suggestive, it stressed the reliability of on-the-scene identifications by trained police officers and concluded that any suggestivity was not impermissible. Id. at 1451-52. The court added that appellant was not prejudiced from its denial of his motion without a hearing because appellant could attack the reliability of the identification at trial. Id. at 1452.
II.
In Jackson v. United States, 420 A.2d 1202 (D.C.1979) (en banc), we considered the question whether the fifth amendment requires an evidentiary hearing on a motion to suppress a lineup identification. We adopted the test established in Duddles v. United States, 399 A.2d 59 (D.C.1979), where we had concluded that, in order to justify a hearing on a fourth amendment suppression motion,
the defendant is obliged, in his [or her] definitive motion papers, to make factual allegations which, if established, would warrant relief (based on evidence discovered of the government and, if necessary, proffered from defendant’s own view of the case).
Jackson, 420 A.2d at 1206 (quoting Duddles, 399 A.2d at 63).
The government believes there is no relevant distinction between a showup identification and a lineup identification and, therefore, contends the Duddles-Jackson test should apply here — i.e., the defendant should have to make factual allegations warranting relief before an evidentiary hearing is required. We disagree. Dud-dles expressly premised its test on the availability to the defendant of evidence about the government’s actions “discovered [from] the government” or “proffered from the defendant’s own view of the case.” Id. In challenging a showup identification, however, a defendant has little access to the evidence necessary to make factual allegations warranting relief, in contrast with the typical lineup identification and fourth amendment seizure situations.
As Judge Newman noted in his dissent in this case at division:
At a lineup, the accused has a right to counsel, whose primary function is to observe the procedure so that facts indicating suggestivity and/or unreliability may be later proven at trial. [Citation omitted.] The accused is, in other words, privy to the facts which might form the basis of a challenge, and can allege them with some specificity in his motion papers.
In re F.G., 534 A.2d 297, 307 (D.C.1987) (Newman, J., dissenting). Such is the case also in most typical fourth amendment contexts. As Judge Newman explained:
An accused is present when an illegal arrest is made, when he or his environs are searched illegally, when a Miranda violation occurs, or when he is compelled to give a confession involuntarily. In addition, he may discover any warrant used by the police under Super.Ct. Crim.R. 16.
Id. at 307 n. 6. In this case, in contrast, F.G. had no right to counsel at the showup. Rather,
[h]e was detained at a street corner while an undercover police [officer] drove by in [727]*727an unmarked car and identified him. He could not see who was identifying him. He could not see how far away the identifying officer was, nor how fast the officer was driving when the identification was made; nor could he know if anything was obstructing the officer’s field of vision at the time of the identification.
Id. at 307. As a result, even if he had a meritorious claim, appellant would probably not be in a position — absent guaranteed, adequate discovery or an evidentiary hearing for which he could subpoena government witnesses — to make factual allegations which, if established, would warrant suppression of the showup identification.
In Clemons v. United States, 133 U.S.App.D.C. 27, 34, 408 F.2d 1230, 1237 (1968) (en banc), cert. denied, 394 U.S. 964, 89 S.Ct. 1318, 22 L.Ed.2d 567 (1969), the United States Court of Appeals for the District of Columbia Circuit stated:
Whenever the prosecution proposes to make eyewitness identification a part of its case, the defense is entitled to know, through disclosure by the prosecution or by evidentiary hearing outside the presence of the jury, the circumstances of any pre-trial identification. [Footnote omitted.]
At oral argument, the government maintained that informal discovery is normally available from the prosecutor sufficient to reveal the type of information necessary to prepare — or in good faith to forego — a suppression motion satisfying the Duddles-Jackson test. Unlike the dissent,3 we are unwilling to assume that the prosecutor’s offer of informal discovery will provide in every case enough relevant information for proper evaluation of a possible motion to suppress a showup identification. The government has provided no guarantee that adequate discovery will be available with the kind of certainty attributable to information discoverable as of right. The government has not conceded, for example, that it would be willing to disclose before trial the names of police witnesses. In short, the government has not proffered a guaranteed discovery formula on which a defendant — or this court — assuredly can rely. Accordingly, we cannot be confident that a defendant subject to a showup identification will have the material essential for a timely pretrial Duddles-Jackson motion. Absent such guaranteed discovery, the only proper course is to guarantee a pretrial evidentiary hearing for a defendant’s challenge to a showup identification at which government witnesses are made available.
The government worries that an eviden-tiary hearing will turn into a burdensome fishing expedition opening the “floodgates of discovery.” In view of its assurances that the prosecutor will volunteer adequate discovery, this concern is ironic — unless the government intends to hold back. In any event, the “floodgates” argument will wither away if the government volunteers through informal discovery enough information to preclude the appropriateness of a suppression motion, or if the trial court exercises proper control — strictly limiting any hearing to facts pertaining to sugges-tivity and reliability of the showup identification.
The government also argues that a defendant’s need can be met by exploring the showup identification at trial. To the extent the government is arguing that cross-examination of government witnesses at trial will suffice, we disagree. That approach may force a defendant who wishes to take the stand in rebuttal to choose between testifying in support of the motion to suppress and invoking the fifth amendment right to silence — a conflict that cannot arise when the suppression motion is resolved before trial. See Simmons v. United States, 390 U.S. 377, 394, 88 S.Ct. 967, 976, 19 L.Ed.2d 1247 (1968) (finding it [728]*728“intolerable that one constitutional right should have to be surrendered in order to assert another” and therefore holding that defendant’s testimony at fourth amendment suppression hearing may not be admitted against defendant at trial on issue of guilt unless defendant makes no objection).4 Perhaps, on the other hand, the government means that such a defendant will be entitled to a mid-trial hearing, outside the presence of the jury, at which the privilege against self-incrimination will not be waived for purposes of the trial itself. If so, then this case is not about whether a defendant is entitled to a hearing; rather it is about when that hearing should take place. In that ease, it makes little sense to argue that it is more efficient to hold evi-dentiary hearings mid-trial than pretrial, in light of the fact that any challenge at trial would interrupt proceedings before the jury. This interruption would be especially serious if the government were to lose and file, a mid-trial appeal.5 Thus, “[i]n an effort to preserve ‘efficient’ summary dispositions of pretrial motions,” the government “proposes a substitute procedure likely to create even greater inefficiencies.” In re F.G., 534 A.2d at 309 (Newman, J., dissenting).
III.
One solution would appear to suit everyone’s needs: an evidentiary hearing as of right immediately before trial when all witnesses are present, unless it clearly appears from informal discovery that the defendant is seeking a hearing in bad faith.6 This solution would typically satisfy the defendant’s need for a hearing, the government’s need to protect its witnesses, and the court’s need for efficiency. This approach, of course, would not preclude an earlier evidentiary hearing, in the trial court’s sound discretion, when circumstances warrant.
In sum, all members of the court appear to agree that a criminal defendant is entitled to all available information necessary to make an informed decision whether a showup identification is subject to effective challenge. Rather than rely solely on the willingness of individual prosecutors to make such information available informally before trial in a particular case — an approach which provides no guarantee of adequacy and consistency — we conclude, as elaborated above, that appellant was entitled to an evidentiary hearing on his motion.
Reversed and remanded.