Nailhead probably has the best advice about just keeping your mouth shut, but...

MMJ is legal in California and there isn't a damn thing LEO's can do about it. Make sure you have a copy of your scrip in your wallet, your glove box etc. If questioned, produce your prescription then keep your mouth shut.

Under California's "Implied Consent Law", you must submit to a breathalyzer test if a LEO demands that you do so. Breathalyzers can't measure thc - you know this, the police know this... Draw your own conclusions.

As far as California's law on the number of plants goes - it makes no sense. It says "... 12 immature OR 6 mature plants..." So ya grow 12 plants and when they reach the point of maturity you kill six????? It makes no sense, but that's the way the law is written.
PharmaCan Reviewed by PharmaCan on . mature and immature plants under sb420 maintaining six or fewer mature or 12 or fewer immature marijuana plants per person with an identification card. does mature mean flowering? can i have 6 flowering plants, and 12 vegging? or can i only have 12 total? i'm a bit confused i don't expect to grow that much; i'd like to have 3 plants flowering, 2 mothers, and 3-4 clones. Rating: 5