Gone but not forgotten
...only the clench and balance can be tested right? I'd assume that the draw would be blocked by the plastic itself, right?
Be aware there are certain devil-may-care madmen among us who might be satisfied with the "will it run a pipecleaner" test and then the peek to see "how-low-and-center-is-the-airhole" test and then the "clench with a plastic cover" test who will THEN actually poke a hole in the plastic cover and execute the potentially lethal "how does it draw and will it whistle" test. Just a heads up.
Also, do you ever do any carpentry and put nails, tacks or screws in you mouth? If so, I have it on good authority that some people at the fastener factory routinely pee on the hardware before it's packaged.
... Of course, we wash our hands in the men's room in McDonald's and open the door by its grimy handle before we eat a sandwich without utensils.