If the home-grown or street marijuana contains bacteria or fungi, smoking it could kill an immunosupressed patient -- like one with AIDS or on chemotherapy.
So you're concerned about AIDS patients and chemotherapy patients? That's wonderful! And you've also made a very good point, robertpaulsen. If patients could receive marijuana through a reputable and/or legal source, they would not have to resort, in desperation, to the "home-grown or street marijuana". I take it you now believe that medical marijuana can be a valuable aid to those who are suffering but you'd prefer it if those patients could receive marijuana that doesn't possibly harbot bacteria or fungi. If so, you have become a compassionate person who cares for those who are suffering needlessly while other people try to rule over their medical care.