​Washington, D.C., would allow patients to have up to two ounces of marijuana a month — enough for about two joints a day — for medical use under a bill that moved forward Tuesday.

Patients would not be allowed to grow their own cannabis under the bill, but a committee would study whether to allow home cultivation by patients and caregivers, and make a recommendation by 2012, reports Malin Berghult at WUSA9

The bill, which was approved by two city government committees on Tuesday, still needs approval of the full City Council. That could come as early as May.

D.C. voters approved an initiative legalizing medical marijuana in 1998, but Congress blocked its implementation until last December.