I got one like this last year, seems to work really well ... tested with double JD's and it seemed to go up 0.2 after each one.
I was surprised on New Years day though, woke up still feeling severely phished (still couldn't really walk straight) and it said I was at 0.0?
Not sure they are valid for the French Police etc though? (Whatever the laws is now?)
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P1 Numero Uno 236/1000
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