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by b1r6 2640 days ago
This is a crucial point. Vendors these days (at least the good ones) properly package their goods with vapor barrier vacuum-sealed bags. Even better, some use Mylar bags which provide a nice metallic aluminum barrier.

You could hold a Mylar bag of weed up to a well-trained drug dog, and it would not trigger. (Unless commanded to falsely by the officer, of course :)