For one thing, washing your hair with anything isn't illegal. If a person is denied a job due to a perfectly legal activity (such as washing your hair), then the employer is opening themselves up to a helluva a lot of discrimination lawsuits. For another, there is no lab that tests for shampoo. They are looking for illegal drugs. When people fail a drug test for an employer, they are only notified that they have failed, either by the MRO reviewing the test or by the employer. No one will ever tell you that you failed because you have a certain type of shampoo in your hair. Why would the laboratory test for shampoo. Psychemedics claims that there is no way that a person can "wash out" THC from their hair. IF that is true, why would they bother wasting time and money on testing for shampoo. They would just test for THC instead. There is a lot of misinformation posted here by different people trying to justify why their technique or treatment didn't work. Some you can believe, some you can't. I know that Jerry G spent a lot of time about a year ago researching what works and what doesn't work. He had polls going, he got quite extensive in his documentation of the results reported here. IF you have noticed, people still post here claiming that the test can detect THC from 10 years ago in your hair. You and I know that this is impossible, but people still post it here. Most of our time here is spent dispelling misinformation and inuendo. I am of the ideal that the more damage you do to your hair, the better the results. Jerry G gets into the open/closed cuticle debate. I just know that those who bleach, dye, straighten, perm or relax their hair, have the best results over washing with harsh shampoos. It all depends on your use history and the type of hair you have. Obviously, if your hair is very strong and thick, it will take more effort and treatments to crack the shaft and damage the hair itself to get inside. IF a person has very fine, thin hair, (not the quantity, but the quality of hair), it is easier to damage. People are constantly asking whether they should do one more bleach, or one more washing, or if they should use baking soda, etc... I believe - Why not? IF your scalp can take the harsh treatments, then the more you do, the better off you are. If you bleach and dye once and you don't pass the drug test, would you feel later "If only I had done it again, I might have passed" If you can do it, and want the job, then do it. No one ever says, "I didn't need that last bleaching, I believe I could have passed without it".