Sometimes, but an old conviction is not automatically admitted just because you take the stand. For a felony conviction, Evidence Code section 788 permits impeachment subject to its listed exceptions. In a criminal trial, People v. Castro requires the prior felony’s least-adjudicated elements to involve moral turpitude, and the judge must still apply Evidence Code section 352. The specific offense, record, similarity to the charged case, and unfair-prejudice risk matter. Seek an advance ruling with counsel before deciding whether to testify. (Evidence Code § 788; People v. Castro; Evidence Code § 352)
A misdemeanor conviction presents a different proof question. A certified official conviction record—or a qualifying digitized copy—may be admissible under Evidence Code section 452.5(b) and section 1280 to prove the offense and other events the record actually contains. That does not make every misdemeanor conviction automatically relevant or admissible to impeach. Duran applied the certified-record exception to a minute order proving a third person’s gang predicate; it was not a defendant-witness impeachment case. Cadogan separately held that merely asking a defendant about misdemeanor convictions can elicit testimonial hearsay when used to establish the underlying misconduct, and emphasized the need for a timely, specific objection. Do not treat a bare question, uncertified document, or details not recorded in the document as equivalent to the qualifying official record. (Evidence Code § 452.5; Evidence Code § 1280; Evidence Code § 1530; People v. Duran; People v. Cadogan)
Separate the proof from the credibility decision
The judge still must consider whether the prior conduct is probative of credibility and whether its probative value is substantially outweighed by risks such as undue prejudice, confusion, or wasted time. Remoteness and similarity to the current charge can matter. A certified record proves what it records; it does not settle every question about moral turpitude, relevance, or section 352. Wheeler predates section 452.5, so its hearsay discussion should not be repeated as a categorical rule barring all misdemeanor conviction records. (Evidence Code § 352; People v. Wheeler)
A charged prior allegation is also different from impeachment. Penal Code section 1025 governs trying certain charged prior allegations; it does not decide what a jury may hear to evaluate credibility if you testify. And the section 788(c) exception for a section 1203.4 dismissal does not apply when the witness is being prosecuted for a subsequent offense. (Penal Code § 1025; Evidence Code § 788)
Keep the exact prior statute, judgment and disposition, any dismissal order, the proposed impeachment evidence, and the current charge available for counsel. The decision whether to testify remains yours after receiving advice; no list of priors alone predicts the ruling. For a California trial-evidence question, contact the Law Offices of David S. Chesley at (800) 755-5174.