Hello, my name is Calvin and I have just recently took a pre employment drug test. It was a hair test and I did not consume any marijuana for a good amount of time (month and a half). I unfortunately tested positive for marijuana and was told my results would be forwarded to the company. However, I called the company about a week and a half later and did not mention the results, but was still asked to come in for orientation. So, my question is, is it possible to test positive for THC on a hair test from a lab, but still have low amount of traces, or nanogram level, in your hair to be considered for employment?