I used to work at a grocery store deli as a dish washer, first real job, the bathroom in the super store regularly had drug users in it and they regularly got busted after they passed out in there. I couldn't believe it at the time or how often it happened but I was young and naieve than. It's no wonder so many businesses don't offer a bathroom to the public.
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Maybe he's born with it.

Maybe it's amphetamines.