Mouth Swab tests?

i've been wondering about this as well, my buddy got pulled over and mouth swabbed for weed about 2 hours after we smoked a blunt and he was charged for DUI and shit. Anyone have info on this?
 
Ive read on here that mouth swabs only can detect use 12-24 hours after smoking. Ive been on other forums and cites and this seems to be the most consistent timing. I would stay away for a few days if you know that you will get tested. I have heard mouth wash works as well as brushing your teeth. Do not let it touch your gums is what i have also been reading.

Hope this at least helped a little!
 
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