Then they would know for sure you were hiding something.DUH!. : ).from experience you are not going to be able to hide drug use and if they think your hiding drug use then they will make sure to either not hire you if your looking for a job or they will make sure to do a unscheduled drug test,so you will not be able to wise up /sober up before hand. We had guys/temps try this and they were always caught /fired.then the information is put in their permanet file for the next employer to read about their habits. And yes ,since your not pulling the root out the drugs would most likely show up in the hair .criminals always think they will never get caught and we both know that is not the case. This is why we have stupid criminal video shows all over the internet. And no I am not calling you stupid ,maybe dumb if your using drugs and trying to figure out a way to hide it while destroying your life,now that is really dumb. Remember you asked the question. It amazes me to watch drug users throw away their life not to mention 10's of thousand s of dollars when they could put that energy to use becoming educated and wealthy and living the good life instead of slowly ruining their life and their families,friends lifes by making them live through it while the drug users destroys themself over time.oh! And this is all to say if you are actually using drugs/in other words a what if scenario.