Hello, I have been scrounging around the forums this morning as I recently heard that I will be getting tested @ GM tomorrow. My question is to see what kind of testing that GM (General Motors) does. I would be thrilled if someone could let me in on what type of test they do. I have found small posts around the net that indicate it might be a hair test. My secondary question is, since I smoke about once a day up to once a week, if it will affect my test to smoke today. I have all the stuff for Mac's cleaning guide as well as I will be buying a shampoo kit if it is a hair test. I'm not worried about urine as I have passed those before. Thanks in advance.