This depends upon whether or not his admission was voluntarily given rather than coerced. If the officer had probable cause to arrest for marijuana possession before he provided his admission, the officer may have needed to read him his rights before asking more questions. It may be possible to suppress the admission. It also may be possible for him to get a SOC on the marijuana possession charge, where the prosecutor may drop the charge after 12 or 24 months if he maintains law abiding...