CA Veh Code Section 23647

(a)

Any person convicted of a violation of Section 23152 or 23153 who is required to participate in a county alcohol and drug problem assessment program shall participate in that program.

(b)

Any person convicted of a violation of Section 23103, as specified in Section 23103.5, in a judicial district that participates in a county alcohol and drug problem assessment program pursuant to this article, may be ordered to participate in the program.