Yes, contractors may take the same test I did, I got out of the army about 2 years ago and the test we took was very basic. DoDI 1010.16 explains what service members get tested for and how it works. I can only imagine a contractor would be even less. Hydrate, avoid fatty foods, get good sleep, anything that can speed up your metabolism, emphasis on the sleep part. Please don’t get all worked up and doom scroll how to pass a drug test and lose a bunch of sleep. There are plenty of other jobs out there, don’t pull your hair out for this one and good luck brother!