§ 344.1. Rules of evidence; proof of previous conviction or
delinquency finding. 1. If in the course of a juvenile delinquency
proceeding, any witness, including a respondent, is properly asked
whether he was previously convicted of a specified offense and answers
in the negative or in an equivocal manner, the party adverse to the one
who called him may independently prove such conviction. If in response
to proper inquiry whether he has ever been convicted of any offense the
witness answers in the negative or in an equivocal manner, the adverse
party may independently prove any previous conviction.

2. If a respondent in a juvenile delinquency proceeding, through the
testimony of a witness other than respondent called by him, offers
evidence of his good character, the presentment agency may independently
prove any previous finding of delinquency of the respondent for a crime
the commission of which would tend to negate any character trait or
quality attributed to the respondent in such witness' testimony.