In my opinion, you should substitute clean urine. There are plenty of good postings and an excellent sticky on here about subbing. I personally am going to sub clean urine by using a 2 oz shampoo bottle and strap it to my inner thigh under my nutsack. I have done that 2 times before. I know exactly how you feel being bothered by it all week. I have been stressed out for days thinking about it even though there is a very good chance that it will go off without a hitch. My main concern is they are planning on testing for hepatitis B, I know for sure I don't have Hepatitis B, but that is tested via blood test and I am concerned about them doing an all in one test via my blood. I smoked 1 week ago and that is about how long it can be detected in your blood from what I have read. So I am worried that there won't be a UA test but just a blood test, I won't know until monday morning when I pick up my paperwork. I might be wrong but I am worried because if I don't get this job it will be a huge opportunity missed. Anyone who knows something about this, weigh in.