The new president willhave to walk a fine line to avoid becomeing a Hypocrit.
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I would imagine that all he has to do is not use drugs.
The statute of limitations on any he has used, if he did use them in the US has long ago run out.
I imagine he could prevent the FBI and DEA from shutting down legal medical pot depositories in California and other places where the voters have rejected harsh bans on cannibis.