- So, of course I was drinking water all night long that night – I did not know what else to do, I have never had to take a drug test like this before, and had no clue who to ask for an advice. And guess what – we showed up for work next day, and they seemed to have forgotten all about us! We did not get the call the next day neither, and the day after that, and after that. It was the most nervous anticipation in my entire life! Needless to say, none of us wanted to go up there and ask when we are going to be tested. Meanwhile, I started to do some research, went online and everything, and also decided to look over the paperwork they gave me. It turned out that we okayed only the random saliva tests, but for urine drug testing they would have to let us know in advance. And then I found out that the drug detection time in saliva is pretty short – if I use only every Friday night, I should be fine to take a test by Wednesday the latest. Different drugs have different detection times, but that chart is so useful, I cannot believe I did not know about it! Just to be in a safe side, I got this little special mouthwash to pass a saliva test in case it happens to be sooner that I expect it. I keep it in my locker, so I always have an easy access to it, just in case – you can never know when they are going to surprise you with it.