The main problem I see with anything like this are the social and legal consequences.
All tests are imperfect, so you have to choose whether to be biased toward false positives or false negatives. Clearly a false negative would be a disaster for the drink recipient. So the test would be biased heavily toward false positives. Normally that’s fine, but in this case it would falsely implicate the drink provider with disastrous legal and social consequences. That’s no good!
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The main problem I see with anything like this are the social and legal consequences.
All tests are imperfect, so you have to choose whether to be biased toward false positives or false negatives. Clearly a false negative would be a disaster for the drink recipient. So the test would be biased heavily toward false positives. Normally that’s fine, but in this case it would falsely implicate the drink provider with disastrous legal and social consequences. That’s no good!