It seems like the locking mechanism is a weak spot as far as compliance goes.  SWS has been reluctant to deploy bear proof cans because their automated garbage trucks can't unlock them, necessitating either the home owner remember to do it before pickup, or the driver get out of the garbage truck to do it (putting him behind schedule, and triggering an extra charge for the home owner).  Also, if the bears got smart enough, they could just cruise neighborhoods on garbage day in the morning before pickup and find all the bins unlocked.  (well, they probably aren't that smart - but they could also just get lucky).