One plant? Oh heck come on! A guy with a clean record otherwise would have to practically deck a cop in the snout whilst being arrested to actually get jail time for a plant or 2~ one of my buddies got busted in MA with a SOPHISTICATED grow that included CO2 injection and a lot of plants, and never served a minute. He got quite a pile of probation, and assloads of $$$ in fines, but after bailing out of lockup never spent another moment behind bars.

Keep the mouth shut and the ears open, and sheesh don't be careless where you smoke!