I took a test 2 weeks ago and watched the lady ahead of me.....technician stood right outside the door of a private bathroom and it got me pretty nervous about the sound of unscrewing my shampoo bottle, so I kind of clanked around my belt buckle to muffle it. No idea what the whizz sounds like but a good buckle shake should be able to cover it up....plus I figure these techs don't make that much and don't really have an incentive to be acting like the NSA.