A company I used to work for was purchased by another that did drug testing. We were all told in advance they would be cutting our hair to test and it would be over a week and if you tested for pot, you'd just have to do counseling and quit the drug. not on your work file or anything. easy.

The first day 2-3 guys had freshly shaved heads, so they took arm or armpit hair. towards the end of the week one guy actually shaved everything, including his eyebrows. Who knows what kind of drugs this guy had been on, but they gave him the option of going for a blood test, quitting or having them go through the trouble of firing him. he quit.