The Fifth Amendment privilege against self-incrimination confers on a criminal defendant the right to give relevant testimony.

See United States v. Crump, 934 F.2d 947, 954-955 (8th Cir. 1991) (upholding trial court's admission of witness's testimony relating to accused's prior bad acts of distributing drugs because accused asserted the defense of entrapment, and such evidence was admissible to prove his predisposition to...A subjective entrapment defense makes an accused's criminal liability contingent on a finding of the accused's predisposition or the accused's lack of predisposition to commit the crime charged and since criminal predisposition is a character trait, the defense of subjective entrapment makes accused's character an element of either a defense or a criminal charge, evidence of accused's criminal predisposition -- including evidence in the form of reputation, opinion, and evidence of specific instances of accused's conduct -- is not barred by the rule against the use of a person's character to show the person's conduct.

Fed. R. Evid. 403 ("Although relevant, evidence may be excluded if its probative value is substantially outweighed by the danger of unfair prejudice, confusion of the issues, or misleading the jury, or by considerations of undue delay, waste of time, or needless presentation of cumulative evidence.").The trial court may exclude relevant evidence if the probative value of evidence is substantially outweighed by the danger of unfair prejudice, confusion of the issues, or misleading the jury, or by considerations of undue delay, waste of time, or needless presentation of cumulative evidence.

United States v. Johns, 15 F.3d 740, 744 (8th Cir. 1994) (upholding trial court's exclusion of victim's sexual history because the accused failed (1) to raise an issue as to the source of semen or injury, and (2) to show prior instances of consensual sex between victim and himself).Rape shield laws frequently make it impermissible -- sometimes in trials of civil actions as well as in criminal trials -- to introduce evidence either to show that an alleged victim of sexual wrongdoing engaged in other sexual behavior or to show the alleged victim's sexual predisposition.