If I were in your shoes and had to take a drug test for a job I would store of some of my own clean urine and freeze it. After using my own frozen samples for 8 months and they all passed lab test I am an advocate of using one's own clean urine for drug testing. Human urine keeps great in the freezer for about a year. If you go that route and need some added info let me know. I seem to be a pro at freezing and warming up human urine for testing. Then when it comes time for your randoms just keep a container of Quick Fix and a hand warmer in your pocket.