OPINION
Opinion by
Russel Cole Harty had previously pled guilty to indecency with a child and had received community supervision. 1 The terms of that community supervision required that Harty, among other things, avoid “injurious and vicious habits”; and “not possess any printed, photographed, or recorded material” that could be used for his “deviant sexual arousal.” Those terms also required that Harty “execute releases of confidential information” allowing free exchange of information between his sex-offender therapist and the corrections department, that Harty submit to periodic polygraph examinations, and that “the polygraph evaluation report shall be provided to your sex offender therapist only.” As required under the terms of his community supervision, Harty submitted to a scheduled polygraph examination. During the pre-examination interview with the polygraph examiner, Harty admitted to numerous violations of his community supervision. After being notified of Harty’s admissions, the State moved to revoke Harty’s community supervision and was successful. 2
*852 Before the revocation hearing was held, Harty had filed a motion to suppress the evidence of his admissions to the polygraph examiner, alleging that those statements were involuntary. At the revocation hearing, Harty again raised the voluntariness issue. Harty indicated a desire to testify for the limited purpose of determining the voluntariness of his statements. The trial court ruled that, even if Harty took the stand for the limited purpose of voluntariness, he would be subject to cross-examination for issues relating to credibility including “other prior admissions.” Harty then declined to testify.
As a result of the hearing, the trial court found that Harty had violated several provisions of his community supervision, revoked Harty’s community supervision, and sentenced Harty to ten years’ imprisonment.
On appeal, Harty raises two issues. Harty claims the trial court erred in ruling that he could be cross-examined concerning prior admissions even if he testified for a limited purpose. In addition, Harty argues the trial court erred in finding the statements were voluntary because his statements were made based on the State’s false representation that Harty’s statements to the polygraph examiner would be disclosed only to Harty’s therapist.
We affirm the trial court’s judgment because we hold that (1) no error as to the scope of cross-examination of Harty has been preserved, and (2) no deception by the State was such as would either offend due process or likely induce an untrue statement from Harty.
(1) No Error as to the Scope of Cross-Examination of Harty Has Been Preserved
In his first point of error, Harty claims the trial court erred in ruling that, if Harty testified concerning the voluntariness of his admissions to the polygraph examiner, Harty could be cross-examined concerning admissions he had made on prior occasions. We disagree. The trial court’s explanation of the ruling is, in the abstract, correct. Further, even if the trial court’s ruling could be interpreted as allowing the State to inquire into the truth of the admissions beyond just cross-examining Harty to test his credibility, no error has been preserved for our review.
“[A] defendant in a criminal case is deprived of due process of law if his conviction is founded, in whole or in part, upon an involuntary confession, without regard for the truth or falsity of the confession, and even though there is ample evidence aside from the confession to support the conviction.”
Jackson v. Denno,
In Texas, the scope of an ordinary cross-examination is not limited to just the matters covered during the direct examination.
Felder v. State,
There are exceptions, though, to the general rule. A defendant may testify at a pretrial hearing on the issue of voluntariness and limit the scope of cross-examination.
See
Tex.R. Evid. 104(d);
see also Crosson v. State,
*854
In addition, a defendant may testify for a limited purpose when the volun-tariness of a statement is challenged at a probation revocation hearing.
Masters v. State,
At Harty’s revocation hearing, the parties discussed, in an unrecorded bench conference, the issue of whether Harty could testify for a limited purpose. After the bench conference, defense counsel and the trial court summarized the bench conference for the record. According to defense counsel, the State had claimed “[i]n essence the question could be asked as to whether the allegations in the motion are true or not.” The trial court’s summary, though, is slightly different. The trial court summarized its ruling as follows:
Just for the record, the defendant who takes the stand to testify, his credibility is always an issue even if he wishes to limit the matter before the court. And accordingly, if he does take the stand in a capacity limited to for instance the voluntariness of his statement, an admission he made on a prior occasion may go to his credibility. I believe that’s the position of the State, is it not....
We note the determination of whether a statement is voluntary must be made without regard to the truth or falsity of the statement.
Denno,
Even if the trial court’s ruling could be interpreted as allowing the State to cross-examine concerning the truth of the admissions made during the polygraph examination, no error has been preserved for our review. To preserve error for appellate review, the substance of the excluded evidence must be shown by offer of proof unless it is apparent from the context of the questions asked. Tex.R.Evid. 103(a)(2); Tex.R.App. P. 33.2;
see Fairow v. State,
Harty’s counsel made an offer of proof consisting of the following concise statement: 5
*855 To preserve the record appropriately and strategically, I have made a decision along with Mr. Harty that he not be called as a witness. But if he would have been called as a witness we would have anticipated his testimony as an offer of proof that he was at the polygraph examiner’s office involuntarily, that he gave any statements that were made involuntarily and not of his own free will.
This statement, while concise, set out only the ultimate question counsel intended to answer through Harty’s testimony — not any specifics that Harty would testify to. Also, the substance of Harty’s testimony is not apparent from the context. Because counsel’s concise statement did not offer any summary of Harty’s prospective testimony but only a conclusion, any error in setting the scope of cross-examination has not been preserved for our review. We overrule Harty’s first point of error.
(2) No Deception by the State Was Such as Would Either Offend Due Process or Likely Induce an Untrue Statement from Harty
Harty also argues that his statements were involuntary. According to Harty, the misrepresentation that the polygraph report would be disclosed only to his therapist was an improper promise and a deception which rendered his confession involuntary. “Trickery or deception does not make a statement involuntary unless the method was calculated to produce an untruthful confession or was offensive to due process.”
Creager v. State,
(a) The Promise Did Not Offend Due Process
“In short, the true test of admissibility is that the confession is made freely, voluntarily and without compulsion or inducement of any sort.”
Haynes v. Washington,
*856 There is no evidence that Harty’s admissions were involuntary other than arguments of defense counsel. We find no evidence that Harty’s statements would not have been made but for the promise he assails. While the terms of community supervision were introduced into evidence, there is no evidence that the terms misled Harty or improperly induced him to make the admissions used to revoke his community supervision. The terms of community supervision were clearly disclosed to Harty. Under those terms, Harty was required to “execute releases of confidential information permitting tree and mutual exchanges of information.... ” In addition, Harty signed a polygraph consent form which provides,
I voluntarily consent to this examination of my own free will, and state that no duress, threats, or coercion have been placed upon me to take this examination .... I further understand that the results of my examination will be made available to the agency or investigation officials that requested this examination.
There is no evidence Harty asserted his right to remain silent during the polygraph examination. Harty has failed to show that any deception was sufficient to cause Harty’s will to be overborne and, thus, that due process was offended.
(b) The Promise Was Not Likely to Induce a False Statement
Whether deception by the State rendered the statements involuntary must be evaluated under the totality of the circumstances.
Creager,
Texas law prohibits the use of any confession given by a defendant under the influence of an improper promise. The Texas Court of Criminal Appeals has summarized the rule as including four requirements. “The promise must be: 1) of some benefit to the defendant, 2) positive, 3) made or sanctioned by a person in authority, and 4) of such character as would be likely to influence the defendant to speak untruthfully.”
Sossamon v. State,
In this case, Harty did not have anything to gain by making false statements, regardless of whether the statements were disclosed to his therapist alone. If the admissions were disclosed only to his therapist, false admissions would have given the therapist incorrect information in formulating Harty’s treatment and thus would likely decrease any benefit Harty was receiving from the treatment. If the admissions were disclosed to authorities, false admissions of violations would clearly be against Harty’s interest. So, in either
*857
event, Harty was not influenced to speak untruthfully.
See Smith v. State,
We overrule this point of error.
We affirm the trial court’s judgment.
Notes
. After Harty’s guilty plea, a jury assessed his punishment at ten years’ imprisonment and recommended the sentence be probated. The trial court placed Harty on community supervision for a term of ten years.
. At the revocation hearing, the State presented evidence of Harty’s admissions. Gory Loveday, Harty’s polygraph examiner, testified that Harty had admitted to masturbating in public, masturbating behind the counter at work while children under the age of seventeen were present in the store, and possessing printed and recorded pornographic material. Harty mentioned that, on one occasion, a sixteen or seventeen-year-old girl may have seen him masturbating. The State did not introduce the results of the polygraph test, which would be inadmissible, see
Robinson v. State,
.The State argues that Article 38.22, Section 5 of the Texas Code of Criminal Procedure allows voluntary statements relevant to credibility to be used in cross-examination. Section 5 provides, “Nothing in this article precludes the admission ... of a voluntary statement whether or not the result of custodial interrogation, that has a bearing upon the credibility of the accused as a witness.”
See
Tex.Code Crim. Proc. Ann. art. 38.22, § 5 (Vernon 2005). The State also cites several cases in support of this proposition, but fails to explain what principle the cases are being cited for.
See United States v. Havens,
.A witness may not be cross-examined about a subject that is collateral and irrelevant to the main issues on trial unless the witness gratuitously testifies as to the matter that is irrelevant or collateral.
Bates v. State,
. Neither the State nor the trial court requested that the offer of proof be made in a question-and-answer format.
See
Tex.R. Evid. 103(b);
Tatum
v.
State,
. We note the Texas Court of Criminal Appeals has held official conduct is not required under Texas law. "While the federal constitution may not be concerned with the , volun-tariness of confessions obtained by non-government officials, our state legislature is. As an evidentiary matter, no involuntary confession is admissible at trial regardless of the source of the confession.”
Alvarado v. State,
*856
