I was tested a couple days ago they use a little thing that looks like a flat tooth brush on th inside of your cheek it feels like sandpaper. They leave it there for 3 min the chemical that is on it eats some of the check cells. then after words all you have is a really bad salt taste in the mouth. so know one knows you ever had the test. most health departments do the test that way noone but you knows you even went in to have it done. just walk in it is free.