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The Boston Globe

Metro

Marijuana dispensaries may have to quality test in Mass.

Proposed state rules for the medical use of marijuana, which regulators will debate Wednesday, would make Massa­chusetts one of the few states that require marijuana dispensaries to test their products for contaminants such as heavy metals and pesticides, but specialists say it is easier to mandate testing than to do it reliably.

Few credible labs will test marijuana products for potency or contaminants for fear of losing federal government contracts, because medical marijuana is not sanctioned by federal law, say researchers who study the medical marijuana industry. That means testing will probably be left up to the dispensaries, they said.

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