Barndweller
Sorry, having re read what I wrote it didn't make it clear, in the UK there would usualy be a gap of 20 mins, IF the driver/pilot/train driver claims he has used it.
In reality, I have given a test to someone 2 minutes after they took a mouthful of mouthwash, and it was a big fat ZERO. In any event even if it wasn't, by the time an evidential test has taken place (A test conducted on a calibrated device at a Police Station) or a blood/urine test the mouth wash would be long gone. Unless of course the person had drunk the bottle, in which case they commit the offence anyway. The offence is alcohol in body, not liquor.
the_hawk
None that I have ever heard of, nor pickled onions/eggs or anything else,