What are they going to do? Are they going to have an inspection? Make everyone open their mouth and say AH?
Wonder is there are studies out on the danger of second hand spit?
There will be plenty of hyper libs with their eye on you.
Biggest problem is how disgusting it can be if one slips on it or sits in it.....if it all goes in the cup and that cup is properly disposed of, then no real problem.