The drug test sounds like BS. I mean, she didn't appear to be under the influence of any drugs. Hell, they only have the jello. Which, regardless of lookalike rules, still ends up being only jello. So what you are saying is any child whose mother has a semi-questionable hobby or occupation, should be subjected to a drug test by the school.
edit: btw, where the hell can you get jello-shots for 3 for a dollar? Would you even make your money back.