Thе Commonwealth asks us to determine whether the trial court erred in its order entered May 19, 1993, denying the Commonwealth’s motion to use the transcript of the preliminary hearing for purposes of introducing the substantive testimony of its key witness, Blaine Cain. The specific circumstances of this case compel us to affirm.
The relevant facts and procedural history are as follows. On June 25, 1992, appellee was charged by criminal complaint with possession of a сontrolled substance with intent to deliver and delivery of a controlled substance. 1 A preliminary hearing occurred on July 10,1992 where the Commonwealth’s chief witness, Blaine Cain, testified against appellee. Mr. Cain testified that he had been acting as á confidential informant for the Commonwealth, something he had done on several past occasions. On this particular incident of February 20, 1992, Mr. Cain allegedly purchased cocaine from appellee. This purchase was the basis for the charges against appellee and the substance of Mr. Cain’s testimony at the preliminary hearing. Defense counsel did cross-examine Mr. Cain at the preliminary hearing about the drug purchase, but he did not question Mr. Cain about his custodial status although Mr. Cain appeared at the preliminary hearing wearing prison garb and in the custody of the deputy sheriffs office. The Commonwealth, however, had not disclosed to defense counsеl that Mr. Cain had a prior criminal record or that he had a pending robbery charge. Mr. Cain’s preliminary hearing testimony was duly recorded and preserved. Following the preliminary hearing, appellee was bound over to the Court of Common Pleas for trial.
On the day scheduled for trial, May 19, 1993, Mr. Cain informed the Commonwealth that he did not intend to testify. The Commonwealth immediately notified all interested parties, and a hearing was held to determine why Mr. Cain would not testify. Mr. Cain indicated an intention to invoke his Fifth Amendment privilege against self-incrimination. *283 The Commonwealth offered Mr. Cain use immunity 2 for his testimony, but Mr. Cain steadfastly refused to testify. The trial court advised Mr. Cain that his testimony could not be used against him under a grant of use immunity. The trial court then ordered Mr. Cain to testify. Mr. Cain refused, and the trial court held him in contempt of court. The Commonwealth then asked the trial court to declare Mr. Cain unavailable and to admit his prior testimony at trial.
On the following day, May 20, 1993, Mr. Cain again refused to testify. As a result, the trial court sentenced him to one year imprisonment in a state correctional institution for contempt. The trial court proceeded to hear arguments from both the Commonwealth and defense counsel on whether Mr. Cain’s prior testimony should be admitted at trial. Defense counsel argued in his oral motion in limine that Mr. Cain’s testimony should not be admitted at trial because defense counsel, lacking information about Mr. Cain’s prior record and pending robbery charge, did not have a full and fair opportunity to cross-examine Mr. Cain at the preliminary hearing. At the conclusion of the May 20, 1993 hearing, the trial court found that Mr. Cain was unavailable but that his testimony would not be admissible at trial because defense counsel had not been aware of Mr. Cain’s prior record and his pending *284 robbery charge, both of which the trial court deemed relevant to Mr. Cain’s credibility. The trial court granted appellee’s oral motion in limine, thus precluding the Commonwealth from introducing the preliminary hearing transcript of Mr. Cain’s testimony.
In making its decision, the trial court stressed that “charges of significant nature, a felony” against Mr. Cain had been dismissed in November of 1991. (N.T. 5/20/93 at 15). Other charges, not specified by the trial court, were also dismissed in November of 1991. Again, in January of 1992, charges against Mr. Cain were dismissed. In addition, the trial court emphasized that Mr. Cain had been charged with robbery in March of 1992, which was between the time of the allegеd drug purchase from the defendant (February 2, 1992) and appellee’s preliminary hearing (July 10, 1992). (N.T. 5/20/93 at 15). The March, 1992 robbery charge was dismissed prior to the preliminary hearing; Mr. Cain pled guilty to theft. To further complicate his history, Mr. Cain had yet another robbery charge pending against him when he testified at appellee’s preliminary hearing. He was thereafter tried and convicted of this robbery offense at a jury trial. (N.T. 6/17/93 at 9). In light of Mr. Cain’s long and complicated criminal history, the trial court determined, now that defense counsel knows of these matters, counsel could have challenged Mr. Cain’s credibility, but only if given the opportunity to question Mr. Cain at trial. (N.T. 5/20/93 at 15; N.T. 6/17/93 at 10). Accordingly, the trial court granted appellee’s oral motion in limine to exclude Mr. Cain’s preliminary hearing testimony at trial, thereby preventing the Commonwealth’s use of the transcript in lieu of Mr. Cain’s actual appearance and live testimony at appellee’s trial. The trial court’s order also continued appellee’s case pending an appeal to this Court based on the Commonwealth’s representation that the trial court’s ruling substantially handicapped the prosecution from going forward with its case against appellee.
The trial court reconsidered its order at a hearing held on June 17, 1993. At the hearing, stipulations were offered to place on the record additional facts which had not been *285 presented at the May 20, 1993 hearing. The Commonwealth offered for stipulation that (1) Mr. Cain was not on parole at the time of the preliminary hearing; (2) a robbery charge against Mr. Cain was dismissed due to insufficient evidence, not because of any agreement with Mr. Cain in exchange for his testimony; and, (3) Mr. Cain actually received no deal for his cooperation at the preliminary hearing. Defense counsel agreed to the above stipulations with the proviso that he would stipulate only to what objectively had occurred, not to any subjective expectation for leniency which Mr. Cain might have had at the time of his preliminary hearing testimony. Following the June 17, 1993 reconsideration hearing, the trial court again denied the Commonwealth’s petition to admit Mr. Cain’s testimony from appellee’s preliminary hearing. Thus, the Commonwealth timely instituted this appeal.
The Commonwealth raises the following issue for our review:
DID THE LOWER COURT ERR IN PRECLUDING THE COMMONWEALTH FROM USING AT TRIAL THE TRANSCRIPT OF THE PRELIMINARY HEARING TESTIMONY OF A MATERIAL WITNESS WHO SUBSEQUENTLY REFUSED TO TESTIFY AT TRIAL AND THUS BECAME UNAVAILABLE TO THE COMMONWEALTH?
Commonwealth’s Brief at 4.
The admissibility of evidence is a matter committed to the sound discretion of the trial court; absent an abuse of that discretion, the trial court’s rulings on admissibility will not be overturned on appeal.
Commonwealth v. Wharton,
*286
“Exceptions to the hearsay rule have been fashioned to accommodate certain classes of hearsay that are substantially more trustworthy than hearsay in general, and thus merit exception to the hearsay rale.”
Id.
at 169,
Pennsylvania common law permits, as an exception to the hearsay rule, the admission of prior recorded testimony from a preliminary hearing provided that (1) the witness responsible for that testimony is presently unavailable; (2) the defendant had counsel; and (3) the defendant had a full and fair opportunity to cross-examine the declarant during the earlier proceeding.
Commonwealth v. McGrogan,
The true test for unavailability of a witness is whether the prosecution has made a good faith effort to produce the live testimony of the witness and, through no fault of its own,
*287
is prevented from doing so.
Commonwealth v. Melson, supra
at 11,
In the case at hand, Mr. Cain steadfastly refused to testify at appellee’s trial, notwithstanding the Commonwealth’s offer of use immunity or the court’s order compelling his testimony. As a result, the trial court found Mr. Cain in contempt of its order and sentenced him to one year in prison. Additionally, the trial court determined that the Commоnwealth exercised all reasonable efforts to compel Mr. Cain’s live testimony at trial. Nevertheless, Mr. Cain refused to testify at appellee’s trial. We agree with the trial court that the Commonwealth has carried its burden to show Mr. Cain is unavailable for the purposes of the hearsay rule exception which would allow the Commonwealth to introduce Mr. Cain’s prior recorded testimony at trial.
See Commonwealth v. Melson, supra
(witness’ refusal to testify despite a court order to do sо constitutes unavailability);
Commonwealth v. Carbaugh,
Whether Mr. Cain’s prior recorded testimony from appellee’s preliminary hearing should be admitted at appellee’s trial depends, therefore, on whether defense counsel had a full and fair opportunity to cross-examine Mr. Cain at that preliminary hearing. The Commonwealth submits that appellee had the benefit of counsel and an opportunity to cross-еxamine Mr. Cain at the preliminary hearing. Although the Commonwealth admits that it did not disclose Mr. Cain’s prior criminal history or his pending criminal charges to the defense, the Commonwealth is willing to stipulate to the following:
(1) Mr. Cain was not on parole at the time of his prior testimony;
*288 (2) Mr. Cain has a prior criminal record, the contents of which can be used by the defense for impeachment purposes without asking Mr. Cain about it directly;
(3) Mr. Cain had criminal charges pending against him at the time of his testimony against appellee;
(4) Mr. Cain and the Commonwealth had no agreement regarding those pending charges in exchange for his testimony; and
(5) Mr. Cain actually received nothing in exchange for his testimony.
An agreement as to these stipulated facts, proffers the Commonwealth, provides the same impeachment value as would the live cross-examination of Mr. Cain at trial. We disagree.
A criminal defendant has a right to cross-examine an adverse witness, according to our federal and state constitutions. Commonwealth v. McGrogan, supra.
Although we have recognized that hearsay rules and the Confrontation Clause are generally designed to protect similar values, we have also been careful not to equate the Confrontation Clause’s prohibitions with the general rule prohibiting the admission of hearsay statements. The Confrontation Clause, in other words, bars the admission of some evidence that would otherwise be admissible under an exception to the hearsay rule.
Idaho v. Wright,
[W]henever a prosecution witness may be biased in favor of the prosecution because of outstanding criminal charges or because of any non-final criminal disposition against him within the same jurisdiction, that possible bias, in fairness, must be made known to the jury. Even if the prosecutor has made no promises, either on the present case or on other pending criminal matters, the witness may hope for favorable treatment from the prosecutor if the witness presently testifies in a way that is helpful to the prosecution. And if that possibility exists, the jury should know about it. The jury may choose to believe the witness even after it learns of actual promises made or possible promises of leniency which may be made in the future, but the defendant, under the right guaranteed in the Pennsylvania Constitution to confront witnesses against him, must have the opportunity at least to raise a doubt in the mind of the jury as to whether the prosecution witness is biased. It is not for the court to determine whether the cross-examination for bias would affect the jury’s determination of the case. While the rule stated today is new, its formulation is actually a mattеr of evolution rather than innovation. As far back as 1909, this Court stated:
It is always the right of a party against whom a witness is called to show by cross-examination that he has an interest direct or collateral in the result of the trial.... The right is not to be denied or abridged because incidentally facts may be developed that are irrelevant to the issue and prejudicial to the other party.
Commonwealth v. Cheatham,
Commonwealth v. Evans,
A preliminary hearing, in general, is a much less searching exploration into the merits of a case than a trial because a preliminary hearing serves the limited function of establishing a
prima facie
case against the accused.
Commonwealth v. Fox,
On the other hand, the opportunity to impeach a witness is particularly important where the Commonwealth’s entire case hinges upon the testimony of the unavailable witness.
Commonwealth v. Bazemore,
The principles enunciated in
Commonwealth v. Bazemore, supra,
were reinforced in
Commonwealth v. Stinson,
Whether the testimony to be introduced at trial as substantive evidence was given at a prior trial or other proceeding, the applicable standard is that of
full and fair opportunity
to cross-examine.
Commonwealth v. Bazemore, supra
at 588,
*292
Given the significance of Mr. Cain’s testimony, as the
only eyewitness
in the instant case, his credibility has become a key issue for trial. Unfortunately, the unavailability of Mr. Cain’s live testimony at trial forecloses appellee’s opportunity to put to the jury Mr. Cain’s subjective expectations, if any, of a deal in exchange for his testimony in favor of the Commonwealth. Appellee has the right to explore the possibility of any coercive power, that the Commonwealth might have had over Mr. Cain, which may have been an incentive for Mr. Cain to testify favorably for the Commonwealth.
Commonwealth v. Lipscomb,
*293 The fact that Mr. Cain’s testimony at the preliminary hearing was given under oath is not dispositive on the issue of the trustworthiness and reliability of that testimony. First, Mr. Cain had not only a prior record but also a history of dismissed charges quite possibly related to his role as a confidential informant in prior instances. Second, Mr. Cain had a robbery charge pending against him at the time of the preliminary hearing. The relevant parties do not dispute that, just before his testimony, Mr. Cain and his supervising law enforcement officer engaged in a heated argument, after which the witness evidenced some reluctance to testify. Following more discussion, the witness did testify favorably for the Commonwealth. Nevertheless, appellee did not have an opрortunity to explore Mr. Cain’s reasons for ultimately testifying as he did. Mr. Cain’s credibility was simply not an issue at the preliminary hearing. See Commonwealth v. Fox, supra. More appropriately a matter for trial, Mr. Cain’s bias or interest must now go untested because of his unavailable live testimony. In balancing the competing interests of the Commonwealth’s need to admit Mr. Cain’s untested prior testimony and appellee’s right to put the matter of Mr. Cain’s potential bias or interest to the jury, we conclude that aрpellee’s right is paramount, especially in light of the fact that Mr. Cain was the only eyewitness to appellee’s alleged offense. See Commonwealth v. Stinson, supra.
*294 Under the specific facts before us on this appeal, we affirm the trial court’s order denying the Commonwealth’s motion to use the transcript of Mr. Cain’s preliminary hearing testimony as substantive evidence against appellee at appellee’s trial under the “prior recorded testimony of an unavailablе witness” exception to the hearsay rule. The use of the transcript in lieu of Mr. Cain’s live testimony does not meet the required safeguards of either the hearsay rules or the Confrontation Clause of our federal and state constitutions.
Order affirmed.
Notes
. 35 P.S. § 780-113(a)(30).
. Use immunity prohibits the use or derivative use of any testimony compelled over a claim of privilege.
Commonwealth v. Swinehart,
. In Commonwealth v. Fox, supra, appellant argued that defense counsel did not have a full and fair opportunity to cross-examine an adverse witness at the preliminary hearing. In fact, when defense counsel asked the witness questions at the preliminary hearing pertaining to the witness’ credibility, the Commonwealth’s objections were sustained. Defense counsеl was precluded, therefore, from impeaching the witness’ testimony. A panel of this Court held that, in light of the clear purpose of a preliminary hearing, the appellant’s claim was without merit. The significant difference between Commonwealth v. Fox, supra and the case sub judice is that Mr. Fox’s adverse witness was available at trial and was cross-examined at that time by counsel for the defense.
. The Commonwealth mentions that Mr. Cain’s prison garb and custodial status at the preliminary hearing were sufficient to put defеnse counsel on notice of the witness’ prior record or pending charges, such that counsel should have asked the reason for the witness' attire. The Commonwealth seeks to shift the burden of disclosure to the appellee as a burden of inquiry.
We recognize that the Commonwealth does not have a duty to disclose what it is not obligated to disclose.
Commonwealth v. Bazemore, supra.
Additionally, the Commonwealth does not necessarily know whether a particular witness will become unаvailable.
Id.
Nevertheless, "as between the competing interests of admitting the former testimony of an unavailable witness and the defendant’s constitutional
*293
right to confront a witness, we find the latter paramount.”
Commonwealth v. Stinson, supra
at 301,
The Pennsylvania Supreme Court, in
Commonwealth v. Baxter,
