The clock ran out on Maryland legislators last night. A bill to give medical marijuana caregivers an affirmative defense against charges of possession was collateral damage as legislators spent the evening trying and failing to reach a budget compromise. It wasn’t a total loss though — two good bills did pass. Here’s MPP’s summary of marijuana policy reform developments in the 2012 session of Maryland’s General Assembly. The two bills that passed are SB 422 and SB 350. The former requires charging…