California Code, Penal Code - PEN § 4852.11

A peace officer shall report to the court, upon receiving a request as provided in Section 4852.1, all known violations of law committed by the petitioner.  Upon receiving satisfactory proof of a violation the court may deny the petition and determine a new period of rehabilitation not to exceed the original period of rehabilitation for the same crime.  In that event, before granting the petition, the court may require the petitioner to fulfill all the requirements provided to be fulfilled before the granting of the certificate under the original petition.