I do not think we would rely on some gadget alone in the case of drugs. Why I am against someone being charged solely on the result of a road side drink test - no matter how "advanced" the gadget. This is why: Mad Doc once posted on here inthe past (or was it PH?

) about a case he had some years ago when he was the duty doctor called to do a blood test. Anyway the woman tested positive on a roadside and the BiB had no choice but to arrest on suspicion on that basis. She did register positive on one of the two later samples at the station apparently , but she insisted she had not been drinking and demanded a blood sample be taken. She was so adamant that the officers agreed. A blood test revealed she liked her pickled onions

,, the acetic acid on her breath trigged the gadget in much the same way as the Fisherman's Friend did....
So .. with the "drugalyser" in particular - we'd have to arrest on suspicion as with booze - but do further tests with a doctor at the station and ensure all procedures were followed to the letter and with fairness to the suspect to ensure we had a case etc. Lemsips - Wildy:neko: is best qualified to discuss properties and side effects on one's body overall - but given the paracetamol content in a Lemsip - whisky is not such a good mixer after all for the morning after....
In some cases - as with alcohol you would have no serious doubts - but with drugs there is always the possibility of residue remaining in body for long time after actually taking the drug. This could continue to impair some but not others - so later tests would have to be pretty tight, comprehensive and conclusive really.
I gather from general conversations with Wildy

in the past and reading of CW and various newspaper articles that a number of over the counter cures are taboo for athletes because of some very arguably slight effects on body.