I'm in Missouri, so paradise compared to Maryland, and initiative wise better than Washington. Heck, our recent constitutional amendment on the subject (http://ballotpedia.org/Missouri_Right_to_Bear_Arms,_Amendmen...) ought to make such an initiative impossible, but the one very bad thing about the state is our courts. So I'm not following Washington state closely, but as I recall there was an "on pain of lawsuit" AG opinion/pledge not to prosecute on temporary transfers. Or see Colorado where the authorities promised not to prosecute folks who left their guns with friends during the nasty flooding not long after the Bloomberg laws passed.

But of course each state's enforcement will be different, and subject to change. The really nasty states didn't start out enforcing their laws in truly nasty ways until the zeitgeist changed enough and laws aimed for blacks and disfavored immigrants were applied to all but the anointed.