Following a jury trial, appellant was convicted of five counts of robbery and one count each of possession of an instrument of crime and involuntary deviate sexual intercourse. Finding no merit in any of appellant’s contentions, we affirm.
I.
Early in the afternoon of July 30, 1976, a man wearing a blue checked shirt and brandishing a gun robbed the West Oak Lane Medical Center and committed an act of involuntary deviate sexual intercourse upon one of the robbery victims. The man stole some credit cards, six car wash slips, and approximately eight hundred dollars. Two of the victims identified appellant as the perpetrator, whereupon the police successfully sought a search warrant for appellant’s home. The probable cause section of the affidavit stated, in its entirety:
On 7/30/76 at approx. 1:30 P.M., a negro male later identified as Johnnie Hutchinson 22 N/M, res. 7426 Briar Rd. entered the West Oak La. Medical Center located at 7353 Limekiln Pk. This male produced the aforementioned gun and proceeded to rob the doctor, nurse and two patients.
Taken in this robbery was approx. $800 total from the victims, and also taken were approx. 6 car wash slips in the nameof [sic] Flourtown Car Wash.
*260 On 7/30/76 at approx. 6:00 P.M., the Affiant displayed 50 or more photos to Complainants, Dr. Jack Solot and Phyllis Till. Each of the complainants identified Hutchinson without question as to the person responsible for this said robbery.
The subsequent search of appellant’s home revealed, inter alia, a blue checked shirt matching that worn by the perpetrator and a .22 caliber gas pellet gun. These items were admitted into evidence at trial.
Appellant contends that the shirt and gun were inadmissible because the search warrant affidavit failed to aver that evidence could be found in his home and therefore did not establish probable cause to justify the search. The affidavit of probable cause must contain sufficient facts to permit a neutral and detached magistrate to conclude with reasonable certainty that a crime has been committed and that evidence or fruits thereof may be found on the premises to be searched.
Aguilar v. Texas,
*262 II.
At trial, while the jury was in recess, appellant attempted to call his brother Larry Hutchinson to admit that he had committed the crimes with which appellant was charged. 2 When Larry invoked his privilege against self-incrimination, appellant sought to introduce alleged admissions against penal interest made by Larry on December 18, 1976, and January 6, 1977. Larry’s first inculpatory statement was made to an investigator from the office of the public defender while that office represented both appellant and his brother. Upon discovery of its conflicting representation, the office of the public defender withdrew as Larry’s counsel, whereupon the lower court appointed new counsel independent of that office. Before Larry could meet with his newly-appointed attorney, the defender took a second, nearly identical inculpatory statement which Larry subsequently signed. Although Larry knew that he was no longer represented by the defender when he made that statement, he was unaware of the existence of the attorney-client privilege. At appellant’s trial, the lower court sustained an objection by Larry’s attorney on the basis of attorney-client privilege and excluded both statements. Appellant now challenges that ruling on this appeal.
“Where legal advice of any kind is sought .. . from a professional legal adviser in his capacity as such, . .. the communications relating to that purpose, . . . made in confidence ... by the client, . .. are at his instance permanently protected ... from disclosure by himself or by the legal adviser, ... except [if] the protection be waived.” 8 J. Wigmore, Evidence § 2292 (McNaughton rev. 1961) (footnote omitted) (hereinafter cited as Wigmore).
See also,
Act of May 23, 1887, P.L. 158, No. 89, § 2(d), 19 P.S. § 686 (“Nor shall counsel be competent to testify to confidential commu
*263
nications made to him by his client, or the client be compelled to disclose the same, unless in either case this privilege be waived upon the trial by the client.”) (repealed and reenacted at 42 Pa.C.S.A. § 5916). The privilege, which attaches to statements made to a lawyer or his agents,
see, e. g., Dabney v. Investment Corp. of America,
Appellant argues, however, that the January 6, 1977 statement is not privileged because it had been made after the attorney-client relationship had ended. We disagree. A fundamental purpose of the attorney-client privilege is to foster full communication between an attorney and his client. See Wigmore § 2291. See also Code of Professional Responsibility, supra EC 4-1. That purpose must be read in the context of the lawyer’s concomitant duty to preserve the confidences and secrets of his client. Id., Canon 4. Disciplinary Rule 4-101 admonishes counsel not to reveal the confidences or secrets of his client, use them to the client’s disadvantage, or use them to the advantage of a third person. Id., DR 4-101(B). A lawyer may, of course, reveal a confidence or secret if the client consents after full disclosure. Id., DR 4-101(C)(l). “A lawyer owes an obligation to advise the client of the attorney-client *264 privilege and timely to assert the privilege unless it is waived by the client.” Id., EC 4-4. In the instant case, the January 6, 1977 statement was a mere reiteration of a privileged statement. Moreover, the January 6, 1977 statement had been made without disclosure of the attorney-client privilege and before Larry could confer with his newly-appointed counsel. Under these circumstances, the lower court properly excluded the January 6, 1977 statement. 3
III.
Appellant contends next that the lower court erred in excluding statements against penal interest which Larry allegedly made to Tracey Taylor on the night of the crime. We disagree. In
Commonwealth v. Hackett, 225
Pa.Super. 22, 29,
IV.
Appellant contends next that the lower court erred in refusing to allow the jury to view Larry Hutchinson. Appellant argues that such an exhibition would have allowed the jury to determine that he and his brother resembled one another and thus would have substantiated his claims of mistaken identity and alibi. We find no error in the lower court’s ruling. Appellant presented no admissible evidence that his brother had committed the crimes with which he had been charged, and there was no evidence that the two brothers looked alike.
5
Moreover, the identification evidence already before the jury was quite positive. Under these circumstances, the lower court properly denied appellant’s request to exhibit Larry to the jury.
Cf. Commonwealth v. Britton,
V.
As part of his alibi defense, appellant called his probation officer, Marilyn Monaco, to testify concerning his appearance on the day in question and to establish his whereabouts after the crime had been committed. Appellant requested that she be identified only as a court employee. The lower court ruled, however, that her status should be disclosed to the jury as evidence of her bias, interest, or prejudice in favor of appellant but that appellant would be entitled to a cautionary instruction. Additionally, the lower court permitted the Commonwealth to impeach Ms. Monaco concerning her interest as a probation officer in discouraging recidivism among her probationers.
Appellant argues that in permitting the disclosure of Ms. Monaco’s status as appellant’s probation officer, the lower court admitted evidence that he had committed other crimes. Even if we were to conclude that the jury could reasonably infer from the disclosure that appellant had committed other crimes,
6
appellant would not be entitled to a new trial because the cautionary instruction, directing the jurors not to consider the fact that appellant had been on probation as evidence of his guilt, removed any possible prejudical effect which may have been occasioned by the disclosure.
Commonwealth
v.
Povish,
*267
Appellant argues also that the lower court should have granted his motion for a mistrial because the Commonwealth’s cross-examination of Ms. Monaco unduly emphasized his status as a probationer and the witness’ possible interest in him. We disagree. A witness may be impeached by cross-examination tending to show that the witness’ bias, interest or prejudice.
Commonwealth v. Hamm,
VI.
Appellant contends finally that the lower court erred in ruling that he could be impeached with a 1972 conviction for aggravated robbery. The burden is upon the Commonwealth to establish that the need for impeachment outweighs the inherent potential for prejudice when it seeks to impeach a defendant with a prior conviction.
See Commonwealth v. Roots,
1) the degree to which the commission of the prior offense reflects upon the veracity of the defendant-witness; 2) the likelihood, in view of the nature and extent of the prior record, that it would have a greater tendency to smear the character of the defendant and suggest a propensity to commit the crime for which he stands charged, rather than provide a legitimate reason for discrediting him as an untruthful person; 3) the age and circumstanc *268 es of the defendant; 4) the strength of the prosecution’s case and the prosecution’s need to resort to this evidence as compared with the availability to the defense of other witnesses through which its version of the events surrounding the incident can be presented; and 5) the existence of alternative means of attacking the defendant’s credibility.
Judgment of sentence affirmed.
Notes
. Appellant contends also that the shirt and gun were inadmissible because they had not been specifically identified in the warrant as items to be seized. We disagree. Although the shirt had not been listed in the warrant, it could be seized under the plain view doctrine because it had been found on appellant’s bed.
Commonwealth v.
Harris,
.
See Commonwealth v. Greene,
. Appellant contends also that his testimony and that of another defense witness, Tracey Taylor, established that Larry had waived the attorney-client privilege. That contention is meritless because neither of them had been present while Larry made the privileged statements. See Wigmore §§ 2311, 2326 & n. 1, 2327.
. Appellant argues also that the lower court erred in excluding Larry’s declaration against penal interest made to him while they had been incarcerated. The lower court properly excluded that evidence because the statement was not made under circumstances evidencing its reliability. See Commonwealth v. Pompey, supra.
. Appellant mistakenly argues that the testimony of a robbery victim, Dr. Jack Solot, established a sufficient basis to warrant showing Larry to the jury. Contrary to appellant’s assertion, Dr. Solot never testified that the brothers, in fact, resembled one another. Instead, he stated that although he had never seen Larry he had been told of him, and of the facts that the brothers resembled one another and that Larry was missing a front tooth.
.
Compare Commonwealth v. Washington,
. Appellant argues also that his testimony was necessary to establish Larry’s declaration against penal interest. As noted above, see note 4, supra, that evidence was inadmissible. Consequently, the lower court did not abuse its discretion in permitting appellant to be impeached by his prior robbery conviction.
