GALLAGHER, Associate Judge:
Appellant was convicted after a jury trial of carrying a pistol without a license (D.C. Code 1973, § 22-3204). On appeal, he contends (1) the trial judge erred when she failed to bar the use of appellant’s prior conviction for second degree murder; (2) trial counsel’s failure to locate and present a witness denied him the effective assistance of counsel; and (3) he was denied his Sixth Amendment right to a speedy trial. We affirm.
At trial
the government presented testimony of the two arresting officers who stated that at about 1:40 p. m. on December 10,1975, they observed appellant and another man walking in the vicinity of a Safeway store in the neighborhood of 12th and Shepherd Streets, N.E. While the two men were under surveillance, one of the officers noticed a bulge in appellant’s right front pants pocket. The officers thereupon stopped appellant and his companion. Appellant removed his hand from his pants pocket at the request of one of the officers, revealing the butt of a .32 caliber pistol. The officer seized the pistol and placed appellant under arrest. According to the officers’ testimony, appellant’s companion, a Mr. Fisher, was searched and questioned, but released at the scene.
Appellant testified that on the day of the offense he drove alone to the home of his half-brother’s girl friend, a Ms. Russ. After parking the car and while walking to the house, appellant and two passersby were stopped by a police scout car. All three were asked for identification. Appellant was arrested in response to erroneous information received by radio that he was an escapee. One of the arresting officers then went to some nearby bushes and picked up a gun, and told appellant it was his (appellant’s) gun. Ms. Russ and appellant’s half-brother, Mr. James A. Watkins, Jr., testified on behalf of appellant that
they had seen a policeman retrieve a gun from the bushes surrounding Ms. Russ’ yard during the time that appellant was stopped by the police.
On cross examination, appellant was impeached with a prior conviction for second degree murder.
He contends such use of his prior conviction was unconditionally barred by D.C. Code 1973, § 14-305(b)(2)(A)(ii) which provides:
(2)(A) Evidence of a conviction of a witness is inadmissible under this section if—
(i) the conviction has been the subject of a pardon, annulment, or other equivalent procedure granted or issued on the basis of innocence, or
(ii) the conviction has been the subject of a certificate of rehabilitation or its equivalent and such witness has not been convicted of a subsequent criminal offense.
While appellant was serving his prison sentence for the 1965 conviction, the District of Columbia Parole Board formally requested the trial court in that case to reduce appellant’s minimum sentence pursuant to D.C. Code 1973, § 24-201c. That section provides, in pertinent part:
When by reason of his training and response to the rehabilitation program of the Department of Corrections it appears to the Board that there is a reasonable probability that a prisoner will live and remain at liberty without violating the law, and that his immediate release is not incompatible with the welfare of society, but he has not served his minimum sen-fence, the Board in its discretion may apply to the court imposing sentence for a reduction of his minimum sentence. The court shall have jurisdiction to act upon the application at any time prior to the expiration of the minimum sentence and no hearing shall be required.
The Parole Board’s request was granted and appellant received an early parole. Appellant contends this grant by the trial court of a reduction of his minimum sentence pursuant to § 24-201c is the equivalent of a certificate of rehabilitation, barring impeachment use of the conviction under § 14-305(b)(2)(A)(ii).
Focusing on the language of § 24-201c, which provides relief “by reason of [a prisoner’s] training and response to the rehabilitation program of the Department of Corrections,” appellant asserts that this statute is the only formal procedure by which the District of Columbia government can recognize an individual’s rehabilitation from crime.
Appellant argues that the language conditioning relief on considerations of rehabilitation, as well as the fact that invocation of the statute both requires affirmative steps by the Parole Board in making the application and requires a formal ruling by the trial court, distinguish § 24-201c from the parole procedure in D.C. Code 1973, § 24-204(a).
Whenever it shall appear to the Board of Parole that there is a reasonable probability that a prisoner will live and remain at liberty without violating the law, that his release is not incompatible with
the welfare of society, and that he has served the minimum sentence imposed or the prescribed portion of his sentence, as the case may be, the Board may authorize his release on parole upon such terms and conditions as the Board shall from time to time prescribe. While on parole, a prisoner shall remain in the legal custody and under the control of the Attorney General of the United States or his authorized representative until the expiration of the maximum of the term or terms specified in his sentence without regard to good time allowance.
Thus, appellant concludes, the grant by the trial court of the Parole Board’s application for a reduction of a prisoner’s minimum sentence so as to make him eligible for early parole (under § 24-204(a)) is an extraordinary procedure, equivalent to a certificate of rehabilitation. Appellant contends further the impeachment use of his prior conviction was highly prejudicial in that the jury was likely to conclude that someone convicted of murder would illegally possess a handgun, and that the case was a close credibility contest between the testimony of appellant and the arresting officers which had, in fact, resulted in a hung jury at the earlier trial.
At a pretrial hearing on defendant’s motion to bar use of the prior conviction, the trial judge ruled that the grant of a reduction of minimum sentence under § 24-201c did not rise “to the dignity of an equivalent of a certificate of rehabilitation.” We agree.
The meaning of the rather indefinite term “certificate of rehabilitation or its equivalent” in § 14-305(b)(2)(A)(ii) is an issue of first impression in this court. We should look therefore to its legislative history to ascertain its intended import. This provision of the statute was based on the proposed Federal Rule of Evidence 609(c), as submitted by the Advisory Committee on Rules of Practice and Procedure of the Judicial Conference of the United States in March, 1969. H.R.Rep.No.907, 91st Cong. 2d Sess. 61-63 (1970); H.R.Rep.No.1303, 91st Cong., 2d Sess. 231 (1970). The proposed rule provided:
(c) Effect of Pardon, Annulment, or Certificate of Rehabilitation.
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GALLAGHER, Associate Judge:
Appellant was convicted after a jury trial of carrying a pistol without a license (D.C. Code 1973, § 22-3204). On appeal, he contends (1) the trial judge erred when she failed to bar the use of appellant’s prior conviction for second degree murder; (2) trial counsel’s failure to locate and present a witness denied him the effective assistance of counsel; and (3) he was denied his Sixth Amendment right to a speedy trial. We affirm.
At trial
the government presented testimony of the two arresting officers who stated that at about 1:40 p. m. on December 10,1975, they observed appellant and another man walking in the vicinity of a Safeway store in the neighborhood of 12th and Shepherd Streets, N.E. While the two men were under surveillance, one of the officers noticed a bulge in appellant’s right front pants pocket. The officers thereupon stopped appellant and his companion. Appellant removed his hand from his pants pocket at the request of one of the officers, revealing the butt of a .32 caliber pistol. The officer seized the pistol and placed appellant under arrest. According to the officers’ testimony, appellant’s companion, a Mr. Fisher, was searched and questioned, but released at the scene.
Appellant testified that on the day of the offense he drove alone to the home of his half-brother’s girl friend, a Ms. Russ. After parking the car and while walking to the house, appellant and two passersby were stopped by a police scout car. All three were asked for identification. Appellant was arrested in response to erroneous information received by radio that he was an escapee. One of the arresting officers then went to some nearby bushes and picked up a gun, and told appellant it was his (appellant’s) gun. Ms. Russ and appellant’s half-brother, Mr. James A. Watkins, Jr., testified on behalf of appellant that
they had seen a policeman retrieve a gun from the bushes surrounding Ms. Russ’ yard during the time that appellant was stopped by the police.
On cross examination, appellant was impeached with a prior conviction for second degree murder.
He contends such use of his prior conviction was unconditionally barred by D.C. Code 1973, § 14-305(b)(2)(A)(ii) which provides:
(2)(A) Evidence of a conviction of a witness is inadmissible under this section if—
(i) the conviction has been the subject of a pardon, annulment, or other equivalent procedure granted or issued on the basis of innocence, or
(ii) the conviction has been the subject of a certificate of rehabilitation or its equivalent and such witness has not been convicted of a subsequent criminal offense.
While appellant was serving his prison sentence for the 1965 conviction, the District of Columbia Parole Board formally requested the trial court in that case to reduce appellant’s minimum sentence pursuant to D.C. Code 1973, § 24-201c. That section provides, in pertinent part:
When by reason of his training and response to the rehabilitation program of the Department of Corrections it appears to the Board that there is a reasonable probability that a prisoner will live and remain at liberty without violating the law, and that his immediate release is not incompatible with the welfare of society, but he has not served his minimum sen-fence, the Board in its discretion may apply to the court imposing sentence for a reduction of his minimum sentence. The court shall have jurisdiction to act upon the application at any time prior to the expiration of the minimum sentence and no hearing shall be required.
The Parole Board’s request was granted and appellant received an early parole. Appellant contends this grant by the trial court of a reduction of his minimum sentence pursuant to § 24-201c is the equivalent of a certificate of rehabilitation, barring impeachment use of the conviction under § 14-305(b)(2)(A)(ii).
Focusing on the language of § 24-201c, which provides relief “by reason of [a prisoner’s] training and response to the rehabilitation program of the Department of Corrections,” appellant asserts that this statute is the only formal procedure by which the District of Columbia government can recognize an individual’s rehabilitation from crime.
Appellant argues that the language conditioning relief on considerations of rehabilitation, as well as the fact that invocation of the statute both requires affirmative steps by the Parole Board in making the application and requires a formal ruling by the trial court, distinguish § 24-201c from the parole procedure in D.C. Code 1973, § 24-204(a).
Whenever it shall appear to the Board of Parole that there is a reasonable probability that a prisoner will live and remain at liberty without violating the law, that his release is not incompatible with
the welfare of society, and that he has served the minimum sentence imposed or the prescribed portion of his sentence, as the case may be, the Board may authorize his release on parole upon such terms and conditions as the Board shall from time to time prescribe. While on parole, a prisoner shall remain in the legal custody and under the control of the Attorney General of the United States or his authorized representative until the expiration of the maximum of the term or terms specified in his sentence without regard to good time allowance.
Thus, appellant concludes, the grant by the trial court of the Parole Board’s application for a reduction of a prisoner’s minimum sentence so as to make him eligible for early parole (under § 24-204(a)) is an extraordinary procedure, equivalent to a certificate of rehabilitation. Appellant contends further the impeachment use of his prior conviction was highly prejudicial in that the jury was likely to conclude that someone convicted of murder would illegally possess a handgun, and that the case was a close credibility contest between the testimony of appellant and the arresting officers which had, in fact, resulted in a hung jury at the earlier trial.
At a pretrial hearing on defendant’s motion to bar use of the prior conviction, the trial judge ruled that the grant of a reduction of minimum sentence under § 24-201c did not rise “to the dignity of an equivalent of a certificate of rehabilitation.” We agree.
The meaning of the rather indefinite term “certificate of rehabilitation or its equivalent” in § 14-305(b)(2)(A)(ii) is an issue of first impression in this court. We should look therefore to its legislative history to ascertain its intended import. This provision of the statute was based on the proposed Federal Rule of Evidence 609(c), as submitted by the Advisory Committee on Rules of Practice and Procedure of the Judicial Conference of the United States in March, 1969. H.R.Rep.No.907, 91st Cong. 2d Sess. 61-63 (1970); H.R.Rep.No.1303, 91st Cong., 2d Sess. 231 (1970). The proposed rule provided:
(c) Effect of Pardon, Annulment, or Certificate of Rehabilitation. Evidence of a conviction is inadmissible under this rule if (1) the conviction has been the subject of a pardon, annulment, certificate of rehabilitation, or other equivalent procedure, and (2)
the procedure under which the same was granted or issued required a substantial showing of rehabilitation
or was based on innocence. [10 Moore’s Federal Practice § 609.01, at VI-99 (2d ed. 1976) (emphasis supplied).]
The express provision in the proposed Federal Rule that the procedure requires “a substantial showing of rehabilitation” was not carried over into the D.C. Code provision. There is no indication in the legislative history that this omission had any significance, however. Rather, the two provisions were considered to be “essentially the same.” H.R.Rep.No.907,
supra
at 61-62; H.R.Rep.No.1303,
supra
at 231.
The Ad
visory Committee’s note to the 1969 Draft of the proposed rule sheds light on the rationale for requiring a showing of rehabilitation:
Subdivision (c).
A pardon or its equivalent granted solely for the purpose of restoring civil rights lost by virtue of a conviction has no relevance to an inquiry into character. If, however, the pardon or other proceeding is hinged upon a showing of rehabilitation the situation is otherwise. The result under the rule is to render the conviction inadmissible. [10 Moore’s Federal Practice,
supra
at VI-102.]
Thus, the intent of this provision of the rule is to shield from impeachment those persons who, although previously convicted of a crime, have nevertheless achieved such a level of character rehabilitation that the prior conviction no longer has any relevance to the witness’ credibility.
Appellant contends the Parole Board’s application for a reduction of his minimum sentence under § 24-201c was such a showing of his rehabilitation. In their Information Supporting Application for Reduction of Minimum Sentence in appellant’s case, the Parole Board cited appellant’s “trustworthiness,” “excellent cooperation,” and “consistent efforts to rehabilitate himself.” It concluded:
[A]fter careful consideration and a thorough study of Williams’ record during his confinement for more than eight (8) years, the Board believes that Williams has responded to the rehabilitative programs available to him in a positive manner and that his adjustment has been excellent. The Board further believes that Charles A. Williams will live and remain in the community without violating the law and that his immediate release into the community would not be incompatible with the welfare of society
A consideration of the legislative history and purposes of § 24-201c and the overall parole scheme in the District of Columbia leads us to the conclusion that the reduction in minimum sentence provided by § 24-201e requires a finding only that the prisoner has responded well to the rehabilitation program of the correctional facility such that his continued incarceration would serve no further useful purpose. In other words, a finding that the prisoner is sufficiently rehabilitated for parole is not equivalent to a finding that he has been so completely rehabilitated that the probative value of his conviction on the issue of his credibility has been diminished.
The parole system serves several broad purposes in correctional policy, among which are balancing sentencing disparities, weighing the expense to society of continued incarceration of an offender against the likelihood of his future criminal acts, and determination of when a prisoner’s rehabilitation will be aided by the opportunity to function as a responsible citizen.
See
S.Rep.No.369, 94th Cong., 2d Sess. 16-17,
reprinted in
[1976] U.S.Code Cong. & Admin.News, pp. 335, 337-38 (legislative history of Parole Commission Reorganization Act, Pub.L.No.94 — 233,18 U.S.C. §§ 4201,
et seq.).
The paroled prisoner remains in the legal custody and control of the Attorney General of the United States until the expiration of his maximum term. D.C. Code 1973, § 24-204(a).
The legislative history of § 24-201c indicates that it was intended to enable the Parole Board “to individualize the handling of the cases as well as correct the great disparity in meting out sentences that now exist [sic],” H.R.Rep.No.451, 80th Cong., 1st Sess. 2 (1947):
Section 4 authorizes the Board to apply to the court which has imposed sentence on a prisoner for a reduction of the minimum sentence of such prisoner when it appears to the Board that there is a rea
sonable probability that the prisoner will live and remain at liberty without violating the law. The court is given authority to pass upon the application at any time prior to the expiration of the minimum sentence, no hearing being required. This provision will permit a court, in its discretion, to correct a mistake in imposing too long a minimum sentence, but only after the Board has found the required facts.
[Id.
at 6.]t
]
That invocation of this provision was not intended to embody a determination by the Parole Board that a prisoner has been fully rehabilitated can be seen by a comparison of § 24-201c with § 24-204(b) (a section of the parole statute), which provides:
(b) Notwithstanding the provisions of subsection (a) of this section, the District of Columbia Council promulgate [sic] rules and regulations under which the Board of Parole, in its discretion, may discharge a parolee from supervision pri- or to the expiration of the maximum term or terms for which he was sentenced.
The legislative history of § 24-204(b) clearly indicates that Congress equated rehabilitation with discharge from parole supervision and not with eligibility for early parole:
[T]he Board of Parole recommends, and the Commissioners concur in its recommendation, that the Board be given authority to discharge from supervision persons who have been under supervision for a long period, where it appears to the Board that
their rehabilitation has been accomplished
and no further useful purpose would be served by maintaining them under parole supervision. [H.R. Rep.No.179, 89th Cong., 1st Sess. 4 (1965) (emphasis supplied).]
Thus, we conclude that the grant of a reduction of minimum sentence so as to render a prisoner eligible for parole is not the equivalent of a certificate of rehabilitation.
Further, it does not evidence a de
gree of rehabilitation sufficient to overcome the relevance of a prior conviction to the witness’ credibility.
Appellant next contends he was denied effective assistance of counsel because trial counsel failed to seek out the only arguably disinterested witness in his behalf. Noting that both of the defense witnesses, appellant’s half brother and his half brother’s girl friend, were close to him, and that the central issue in the case was his credibility vis-a-vis the arresting officer, appellant argues that trial counsel’s pretrial investigation was inadequate because he failed to obtain police records of the stop which would have enabled him to locate the Mr. Fisher who was present at the arrest.
A defendant’s Sixth Amendment right to effective assistance of counsel is violated if there has been gross incompetence of counsel which has in effect blotted out the essence of a substantial defense.
Angarano v. United States,
D.C.App., 312 A.2d 295, 298 n.5 (1973), adopting the standard of
Bruce v. United States,
126 U.S. App.D.C. 336, 339-40, 379 F.2d 113, 116-17 (1967). As a general rule, “[cjounsel has a duty to conduct an independent investigation of the facts and circumstances of a given case.”
Oesby v. United States,
D.C.App., 398 A.2d 1, 8 n.14 (1977). This is especially important where the central issue is the relative credibility of the defendant and key government witnesses.
See Farrell v. United States,
D.C.App., 391 A.2d 755, 761 & n.2 (1978). Although in
Angarano v. United States, supra
at 301, we acknowledged the possibility that failure to call a witness or investigate possible facts may amount to ineffectiveness of counsel, in
Woody v. United States,
D.C.App., 369 A.2d 592, 594 (1977), we concluded that failure to locate an unknown witness whom defendant claimed was present at the scene of the crime was not ineffective assistance of counsel.
“[A] substantial defense lost due to incompetence must be shown to be a defense as a matter of law and available from facts known or obvious to the trial attorney.”
Id.
at 594. In other words, does the incompetence of counsel asserted by a defendant, if true, entitle him to relief?
Angarano v. United States, supra
at 298. “This court, of course, will not engage in vague speculation about the kind of investigation trial counsel might have made or what witnesses he might have called.”
Atkinson v. United States,
D.C.App., 366 A.2d 450, 453 (1976). Appellant has made no showing that Mr. Fisher would have been available for trial or what the nature of his testimony might have been.
Our review of the record leads
us to conclude that Mr. Fisher’s testimony would have been at best cumulative and at worst contradictory to his defense. Testimony about Mr. Fisher’s identity was conflicting, even among the defense witnesses. Appellant testified that he arrived alone in his car and got out, whereupon he and two unknown passersby (of whom one is alleged to be Mr. Fisher) were summoned together to the police scout car. Mr. Watkins testified that he first saw appellant that day coming down the street and that appellant was walking alone when stopped by the police. Ms. Russ testified that appellant and Mr. Watkins arrived together in appellant’s car and that appellant was standing by the car alone when he was apprehended. The arresting officers, on the other hand, testified that they had observed appellant and Mr. Fisher walking and talking together in the area for some time.
In
Johnson v. United States,
D.C.App., 413 A.2d 499 (1980), we held that “a ‘substantial defense’ is ‘blotted out’ when
highly credible evidence
which would have impeached the credibility of a key government witness is lost through incompetence.”
Id.
at 504 (emphasis supplied). Appellant contends Fisher was a disinterested witness who would have rebutted the testimony of the police officer. Whether Fisher’s testimony in fact would have established that appellant was not in possession of the gun, however, is purely a matter of conjecture. Defendants face a “heavy burden of proving prejudice” in asserting a claim of ineffective assistance of counsel.
Thornton v. United States,
D.C.App., 357 A.2d 429, 435,
cert. denied,
429 U.S. 1024, 97 S.Ct. 644, 50 L.Ed.2d 626 (1976). Here, appellant has failed to establish any link between the missing testimony and the loss of “a substantial defense ... as a matter of law ... available from facts known or obvious to the trial attorney.”
Woody v. United States, supra
at 594. Indeed, even if Fisher would have testified as appellant contends, his testimony, while perhaps of greater weight because it was allegedly disinterested, would only have been cumulative of the consistent testimony of the three defense witnesses that the police retrieved the gun from the bushes. We cannot say that failure to present such a witness rises to the level of constitutional ineffectiveness.
Appellant’s final contention is that he was denied his Sixth Amendment right to a speedy trial by the delay between his first and second trials. The test enunciated in
Barker v. Wingo,
407 U.S. 514, 530, 92 S.Ct. 2182, 2191, 33 L.Ed.2d 101 (1972), requires consideration of four factors in evaluating an appellant’s speedy trial claim: (1) the length of the delay; (2) the reasons for the delay; (3) the defendant’s assertion of his right; and (4) the prejudice to the defendant. The lapse of more than one year gives prima facie merit to a claim that an accused has been denied his right to a speedy trial,
Bethea v. United States,
D.C.App., 395 A.2d 787, 790 (1978);
United States v. Bolden,
D.C.App., 381 A.2d 624, 627 (1977);
Branch v. United States,
D.C.App., 372 A.2d 998, 1000 (1977), (shifting the burden to the government to justify the delay). Nevertheless, the claim must still be evaluated in light of the other three
Barker
factors.
Reid v. United States,
D.C. App., 402 A.2d 835, 837-38 (1979);
Bowman v. United States,
D.C.App., 385 A.2d 28, 30 (1978).
After appellant’s first trial ended in a mistrial in April 1976, a new trial was scheduled for July 7, 1976. Of the approximately 21 months which elapsed between that date and the actual commencement of his second trial of April 11, 1978, approxi
mately ten months are attributable to continuances made at defense request, or granted because of illness and withdrawal of defense counsel or failure of defendant to appear. Approximately five months are attributable to two government-requested continuances and the remaining six months to institutional delays because the trial court was unavailable. There is no evidence that the delay is attributable to “arbitrary, purposeful, oppressive, or vexatious action” by the government.
Strickland v. United States,
D.C.App., 389 A.2d 1325, 1330 (1978),
cert. denied,
440 U.S. 926, 99 S.Ct. 1258, 59 L.Ed.2d 481 (1979). Although the prosecution is usually charged with institutional delays,
see United States v. Perkins,
D.C.App., 374 A.2d 882, 883 (1977), the government is not faulted as strongly for delays inherent in the judicial system as it is for those attributable to its own deliberate action.
Reed v. United States,
D.C.App., 383 A.2d 316, 319,
cert. denied,
439 U.S. 871, 99 S.Ct. 203, 58 L.Ed.2d 183 (1978);
United States v. Perkins, supra.
Appellant was not incarcerated during this period and his claim that the delay hampered his trial preparation is wholly without merit. Furthermore, appellant failed to raise his speedy trial claim any time prior to appeal. Reviewing all the circumstances in light of the
Barker
test, we conclude that appellant was not denied his right to a speedy trial.
Accordingly, appellant’s conviction must be
Affirmed.