Don't they do that anyway?
Who ever came up with the idea to press pills with BTC on them obviously didn't think of the ramification such a pill could have. People are being stopped and searched as it is and now with a E tab named bitcoin, it's just gonna make it worse..
......lets not forget the use of street slang for items like this. I see these being called "B"'s due the the buyer not having a single fuck or care (or the brain power) to know or remember the word bitcoin. You only have to have a look at what other E pills are not being called by their intentional names. Most people will just ask for pills, e's. If BTC pressed pills are really good ( or shit) then people will remember the name I guess.
Edit: There are pills for the $, euro so we will always have a counter argument