So we can go after drug dealers who put LEAD in their product to increase sales weight:
The cases, documented in an article in the current issue of the New England Journal of Medicine, involve 29 young adults, ages 16 to 33, who were hospitalized in Leipzig, Germany, with lead poisoning during a period of several months.
While doctors were initially baffled by the rash of poisonings, they eventually determined that all had smoked marijuana that had been tainted with small lead particles.
That's some heavy shit, man.
UPDATE:
Here's the NEJM article with pictures of one of the tainted bags of weed.
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