State lawmakers, local law enforcement and medical cannabis patients are anxiously waiting on a decision from the federal Drug Enforcement Administration on whether to reschedule marijuana under the federal Controlled Substances Act, a move that could open the door to new research on the drug. In a memo released this week, DEA officials said they plan to make a decision by July. Growing scientific evidence, shifting public opinion and changing state laws regarding both medical and recreational use of marijuana have been cited as prompting the review.