Excuse me, but he marijuana did not kill the patient. The bacteria, which could have been eliminated, did. This is a feeble argument, based on the logical fallacy of the excluded middle. Pretty good for a drug warrior, though.
Could have, but wasn't. And there is nothing in any of the state medical marijuana laws which solves this problem.
Therefore, we can conclude that the medical marijuana allowed by these states can kill immunosuppressed patients. If some doctor "recommended" homegrown marijuana to one of my family members undergoing chemo and they died from pulmonary aspergillosis, I'd own his house, car, and half his income.
This borders on quackery.