Opinion of the Court
CRAWFORD, Judge:
Contrary to his pleas, appellant was convicted by a general court-martial composed of officer and enlisted members of dereliction of duty (3 specifications), maltreatment (4 specifications), and indecent assault (4 specifications), in violation of Articles 92, 93, and 134, Uniform Code of Military Justice, 10 USC §§ 892, 893, and 934, respectively. Appellant committed these offenses against three female sailors, including Airman Apprentice (AA) S and Airman (AN) M, under the guise of performing medical examinations. The convening authority approved the sentence of a bad-conduct discharge, 2 years’ confinement, total forfeitures, and reduction to the lowest enlisted grade. The Court of Criminal Appeals set aside the findings of guilty to dereliction of duty, dismissed that Charge and its specifications, and affirmed the sentence. 44 MJ 603 (1996).
We granted review of the following issues:
I. WHETHER THE MILITARY JUDGE ABUSED HIS DISCRETION, AND VIOLATED APPELLANT’S SIXTH AMENDMENT RIGHT TO CONFRONTATION, WHEN HE EXCLUDED DEFENSE EVIDENCE OF AA S’S PRIOR REPORT OF RAPE.
II. WHETHER AGENTS OF THE NAVAL CRIMINAL INVESTIGATIVE SERVICE [NCIS] ENGAGED IN INVESTIGATORY MISCONDUCT.
We hold that the military judge did not abuse his discretion in excluding defense evidence of AA S’s prior report of rape. Additionally, we hold that the NCIS did not violate appellant’s Fifth Amendment or Article 311 rights.
FACTS — ISSUE I
Prior to trial, the Government moved in limine to exclude any evidence regarding AA S’s prior allegation of rape. At an Article 39(a)2 session, AA S testified that she had been raped by her cousin in December 1991. She did not report the attack until nearly 2 years later while she was in boot camp. At that time, an enlisted staff member of the recruit training command referred her to the Family Service Center for counseling.
The defense team argued:
Your Honor, the defense does — does not take issue with the Government’s intention [sic] that this was a truthful report of a rape. It’s offered under 608(c) to show bias was established — it’s been established through the testimony at the Article 32 hearing that there was an abdominal examination of — of Airman Apprentice S[ ]. Prior rape could very easily have sensitized her to — to contact of any nature and could have — could have created a bias in that sense and could have caused her to misinterpret what was otherwise a legitimate abdominal exam.
[427]*427... The contention is that the rape — the trauma of any rape — the fact that she had discussed it two days earlier with another physician on the 16th of March would have made her vulnerable to — to leading questions and would go to her state of mind at the time she was questioned by Sandy Maclsaac — at the time that she made the complaint against HM1 Sojfer in response to Special Agent Sandy Maclsaac’s questioning of her.
The Government’s counter-argument was that the fact that AA S had been raped did not make it more likely that she would have a bias under Mil.R.Evid. 608(c), Manual for Courts-Martial, United States (1995 ed.). The military judge excluded any evidence of the prior alleged rape but advised defense counsel that if they had an additional proffer later, he would be willing to reconsider the ruling.
DISCUSSION — ISSUE I
For evidence to be admissible, it must be both logically and legally relevant.3 The rules of logical and legal relevance also apply to methods of impeachment.
There are various methods of impeachment. Some of them are based on the Military Rules of Evidence: Character for untruthfulness,4 prior conviction,5 instances of misconduct not resulting in a conviction,6 pri- or inconsistent statement,7 and bias.8 Others are based on common-law rules: Prior inconsistent acts,9 specific contradiction,10 and “deficiencies in the elements of competency.”11
Issue I centers on bias and deficiencies in the elements of competency,12 also known as capacity to employ one’s senses. There are similarities between bias and capacity to observe, remember, and recollect. Both are grounds for impeachment, and both may be proven by extrinsic evidence. However, before the proponent may introduce evidence under either theory,13 he or she must lay a foundation that establishes the legal and logical relevance of the impeaching evidence. Mil.R.Evid. 401 and 402; see gen-[428]*428orally E. Imwinkelried, Evidentiary Foundations (3d ed.1995).
How a witness “views” an event, in terms of her five senses, depends on her background, including family life, education, and day-to-day experiences. Witnesses “behave according to what [they] bring to the occasion, and what each of [them] brings to the occasion is more or less unique.”14 In that sense, each witness has a bias.
Additionally, a witness’ interpretation of an event depends on whether her perception is impaired. For example, the individual may be hearing-impaired or may not have been wearing corrective lenses at the time of the crime. A past or present mental condition also may impact on a person’s ability to perceive.15
Neither the common-law rules nor the rules of evidence may trump the defendant’s Sixth Amendment right to cross-examine opposing witnesses. Davis v. Alaska, 415 U.S. 308, 94 S.Ct. 1105, 39 L.Ed.2d 347 (1974); Smith v. Illinois, 390 U.S. 129, 88 S.Ct. 748, 19 L.Ed.2d 956 (1968). In Davis, the Supreme Court held that a state law designed to protect the confidentiality of juvenile convictions could not be used to preclude defense cross-examination of a crucial prosecution witness. 415 U.S. at 319, 94 S.Ct. at 1112. There, a bar was broken into and a safe weighing several hundred pounds was removed. It was found 26 miles from the site of the breaking and entering, just outside the home of Jess Straight and his family. Straight’s step-son, Richard Green, told investigators that he had seen two unknown men standing alongside a late-model blue Chevrolet hear where the safe was discovered. Id. at 309, 94 S.Ct. at 1107. Because Green had been placed on probation as a result of a juvenile conviction, the defense sought to cross-examine him to establish that he was identifying other individuals to avoid a revocation of his own probation. Id. at 310-11, 94 S.Ct. at 1107-08. The Court held that “the right of confrontation is paramount to the State’s policy of protecting a juvenile offender.” Id. at 319, 94 S.Ct. at 1112:
The defense argued that the prior rape should be admitted because a rape victim is more likely to be biased or misinterpret a proper medical examination. However, the defense offered no support for its theory that a prior rape showed bias or would have an impact on the victim’s ability to feel or remember.
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Opinion of the Court
CRAWFORD, Judge:
Contrary to his pleas, appellant was convicted by a general court-martial composed of officer and enlisted members of dereliction of duty (3 specifications), maltreatment (4 specifications), and indecent assault (4 specifications), in violation of Articles 92, 93, and 134, Uniform Code of Military Justice, 10 USC §§ 892, 893, and 934, respectively. Appellant committed these offenses against three female sailors, including Airman Apprentice (AA) S and Airman (AN) M, under the guise of performing medical examinations. The convening authority approved the sentence of a bad-conduct discharge, 2 years’ confinement, total forfeitures, and reduction to the lowest enlisted grade. The Court of Criminal Appeals set aside the findings of guilty to dereliction of duty, dismissed that Charge and its specifications, and affirmed the sentence. 44 MJ 603 (1996).
We granted review of the following issues:
I. WHETHER THE MILITARY JUDGE ABUSED HIS DISCRETION, AND VIOLATED APPELLANT’S SIXTH AMENDMENT RIGHT TO CONFRONTATION, WHEN HE EXCLUDED DEFENSE EVIDENCE OF AA S’S PRIOR REPORT OF RAPE.
II. WHETHER AGENTS OF THE NAVAL CRIMINAL INVESTIGATIVE SERVICE [NCIS] ENGAGED IN INVESTIGATORY MISCONDUCT.
We hold that the military judge did not abuse his discretion in excluding defense evidence of AA S’s prior report of rape. Additionally, we hold that the NCIS did not violate appellant’s Fifth Amendment or Article 311 rights.
FACTS — ISSUE I
Prior to trial, the Government moved in limine to exclude any evidence regarding AA S’s prior allegation of rape. At an Article 39(a)2 session, AA S testified that she had been raped by her cousin in December 1991. She did not report the attack until nearly 2 years later while she was in boot camp. At that time, an enlisted staff member of the recruit training command referred her to the Family Service Center for counseling.
The defense team argued:
Your Honor, the defense does — does not take issue with the Government’s intention [sic] that this was a truthful report of a rape. It’s offered under 608(c) to show bias was established — it’s been established through the testimony at the Article 32 hearing that there was an abdominal examination of — of Airman Apprentice S[ ]. Prior rape could very easily have sensitized her to — to contact of any nature and could have — could have created a bias in that sense and could have caused her to misinterpret what was otherwise a legitimate abdominal exam.
[427]*427... The contention is that the rape — the trauma of any rape — the fact that she had discussed it two days earlier with another physician on the 16th of March would have made her vulnerable to — to leading questions and would go to her state of mind at the time she was questioned by Sandy Maclsaac — at the time that she made the complaint against HM1 Sojfer in response to Special Agent Sandy Maclsaac’s questioning of her.
The Government’s counter-argument was that the fact that AA S had been raped did not make it more likely that she would have a bias under Mil.R.Evid. 608(c), Manual for Courts-Martial, United States (1995 ed.). The military judge excluded any evidence of the prior alleged rape but advised defense counsel that if they had an additional proffer later, he would be willing to reconsider the ruling.
DISCUSSION — ISSUE I
For evidence to be admissible, it must be both logically and legally relevant.3 The rules of logical and legal relevance also apply to methods of impeachment.
There are various methods of impeachment. Some of them are based on the Military Rules of Evidence: Character for untruthfulness,4 prior conviction,5 instances of misconduct not resulting in a conviction,6 pri- or inconsistent statement,7 and bias.8 Others are based on common-law rules: Prior inconsistent acts,9 specific contradiction,10 and “deficiencies in the elements of competency.”11
Issue I centers on bias and deficiencies in the elements of competency,12 also known as capacity to employ one’s senses. There are similarities between bias and capacity to observe, remember, and recollect. Both are grounds for impeachment, and both may be proven by extrinsic evidence. However, before the proponent may introduce evidence under either theory,13 he or she must lay a foundation that establishes the legal and logical relevance of the impeaching evidence. Mil.R.Evid. 401 and 402; see gen-[428]*428orally E. Imwinkelried, Evidentiary Foundations (3d ed.1995).
How a witness “views” an event, in terms of her five senses, depends on her background, including family life, education, and day-to-day experiences. Witnesses “behave according to what [they] bring to the occasion, and what each of [them] brings to the occasion is more or less unique.”14 In that sense, each witness has a bias.
Additionally, a witness’ interpretation of an event depends on whether her perception is impaired. For example, the individual may be hearing-impaired or may not have been wearing corrective lenses at the time of the crime. A past or present mental condition also may impact on a person’s ability to perceive.15
Neither the common-law rules nor the rules of evidence may trump the defendant’s Sixth Amendment right to cross-examine opposing witnesses. Davis v. Alaska, 415 U.S. 308, 94 S.Ct. 1105, 39 L.Ed.2d 347 (1974); Smith v. Illinois, 390 U.S. 129, 88 S.Ct. 748, 19 L.Ed.2d 956 (1968). In Davis, the Supreme Court held that a state law designed to protect the confidentiality of juvenile convictions could not be used to preclude defense cross-examination of a crucial prosecution witness. 415 U.S. at 319, 94 S.Ct. at 1112. There, a bar was broken into and a safe weighing several hundred pounds was removed. It was found 26 miles from the site of the breaking and entering, just outside the home of Jess Straight and his family. Straight’s step-son, Richard Green, told investigators that he had seen two unknown men standing alongside a late-model blue Chevrolet hear where the safe was discovered. Id. at 309, 94 S.Ct. at 1107. Because Green had been placed on probation as a result of a juvenile conviction, the defense sought to cross-examine him to establish that he was identifying other individuals to avoid a revocation of his own probation. Id. at 310-11, 94 S.Ct. at 1107-08. The Court held that “the right of confrontation is paramount to the State’s policy of protecting a juvenile offender.” Id. at 319, 94 S.Ct. at 1112:
The defense argued that the prior rape should be admitted because a rape victim is more likely to be biased or misinterpret a proper medical examination. However, the defense offered no support for its theory that a prior rape showed bias or would have an impact on the victim’s ability to feel or remember. Had there been a proffer that a mental illness or infirmity affected AA S’s capacity to observe and feel, there might be a different result, unless the evidence otherwise was inadmissible under another rule.16
In this instance, it is improbable that the victim misinterpreted appellant’s placing his hand on her genital area as an indecent assault rather than a proper abdominal examination. Thus, we hold that the judge did not err in excluding the defense evidence.
FACTS — ISSUE II
Appellant contends NCIS agents twice misrepresented the facts of the case to him. The first instance relates to Special Agent (SA) Maclsaac’s interview about these allegations after appellant waived his rights. SA Maelsaac interrogated appellant alone for the first hour and was thereafter assisted by SA Rene Vasquez. Appellant denied the allegations. He told his interrogators that he remembered AN M, and he talked with them about his physical examinations of her. Ap[429]*429pellant admitted examining her abdomen on at least one occasion, but he denied touching her vaginal area.
At one point, SA Vasquez confronted appellant by saying, “You touched her pubic hairs.” Appellant immediately responded, “Excuse me. She is shaved.” After a moment of silence, SA Maelsaae said, “Well, I know that and Rene Vasquez knows that; how do you know that?” SA Maelsaae knew that AN M shaved her pubic area because this fact was contained in her written statement. However, SA Vasquez was not aware of this. Appellant explained that he saw and felt part of AN M’s pubic region during his examination of her abdomen while, he said, an observer was present.
The second misrepresentation was that SA Maelsaae did not disclose to AA S, when he interviewed her, that he was investigating allegations of professional misconduct against appellant. SA Maclssac told AA S that he was conducting a quality assurance review of the sick call records. Appellant first raised the fraud and trickery allegations in his post-trial submissions.
DISCUSSION — ISSUE II
The Fifth Amendment provides: “No person ... shall be compelled in any criminal case to be a witness against himself nor be deprived of life, liberty, or property without due process of law____” Article 31(d), UCMJ, 10 USC § 831(d), prohibits admission into evidence of any statement from an accused obtained “through the use of coercion, unlawful influence, or unlawful induce-ment____”
In Hopt v. Utah, 110 U.S. 574, 583-87, 4 S.Ct. 202, 206-09, 28 L.Ed. 262 (1884), the Supreme Court applied the common-law rule17 prohibiting use of unreliable confessions. Additionally, the Supreme Court has sought to protect individuals against offensive police practices. Rogers v. Richmond, 365 U.S. 534, 81 S.Ct. 735, 5 L.Ed.2d 760 (1961). That Court has applied a totality-of-the-circumstances test in determining the voluntariness of a confession. Haynes v. Washington, 373 U.S. 503, 512, 83 S.Ct. 1336, 1342, 10 L.Ed.2d 513 (1963). Applying this test, “[t]he necessary inquiry is whether the confession is the product of an essentially free and unconstrained choice by its maker.” United States v. Bubonics, 45 MJ 93, 95 (1996). As the Supreme Court indicated in its first case on the subject: “It is difficult, if not impossible, to formulate a rule that will comprehend all cases.” Hopt, 110 U.S. at 583,4 S.Ct. at 207. However, over the years, the Supreme Court and this Court have examined numerous circumstances, including rights’ warnings;18 the length of the interrogation;19 the characteristics of the individual, including age and education;20 and the na[430]*430ture of the police conduct, including threats,21 physical abuse,22 and incommunicado detention.23
There is not the slightest indication that appellant sought to stop the interrogation or request an attorney. Nor is there evidence of a lengthy interrogation or that the police made threats and promises to appellant to obtain his statement. Appellant does not have a low IQ, and he completed 12 years of education. Thus, we hold, based on the totality of the circumstances, that appellant’s statement was voluntary and admissible in evidence.
The decision of the United States Navy-Marine Corps Court of Criminal Appeals is affirmed.
Chief Judge COX and Judges GIERKE and EFFRON concur.