The Admissibility of Prior Bad Acts in Sexual Offense Cases in California
Evidence Code section 1108 provides that in cases in which the defendant is accused of a sexual offense, evidence of the defendant's commission of another sexual offense is not made inadmissible by section 1101, if the evidence is not inadmissible pursuant to Evidence Code section 352.
Evidence Code such 1101 provides in relevant part:
"(a) Except as provided in this section and in . . . Evidence Code, section 1108 . . . evidence of a person's character or a trait of his or her character (whether in the form of an opinion, evidence of reputation, or evidence of specific instances of his or her conduct) is inadmissible when offered to prove his or her conduct on a specified occasion.
(b) Nothing in this section prohibits the admission of evidence that a person committed a crime, civil wrong, or other act when relevant to prove some fact (such as motive, opportunity, intent, preparation, plan, knowledge, identity, absence of mistake or accident, or whether a defendant in a prosecution for an unlawful sexual act or attempted unlawful sexual act did not reasonably and in good faith believe that the victim consented) other than his or her disposition to commit such an act."
Evidence Code section 352 provides, "The court in its discretion may exclude evidence if its probative value is substantially outweighed by the probability that its admission will (a) necessitate undue consumption of time or (b) create substantial danger of undue prejudice, of confusing the issues, or of misleading the jury."
In People v. Falsetta (1999) 21 Cal.4th 903, the Supreme Court described the factors a court should consider in determining whether to admit evidence under Evidence Code section 352 that is otherwise admissible under Evidence Code section 1108:
"Trial judges must consider such factors as its nature, relevance, and possible remoteness, the degree of certainty of its commission and the likelihood of confusing, misleading, or distracting the jurors from their main inquiry, its similarity to the charged offense, its likely prejudicial impact on the jurors, the burden on the defendant in defending against the uncharged offense, and the availability of less prejudicial alternatives to its outright admission, such as admitting some but not all of the defendant's other sex offenses, or excluding irrelevant though inflammatory details surrounding the offense." (Falsetta, supra, 21 Cal.4th at p. 917.)