I had to take a pre-employment hair test and they took samples from my chest and had me re-test. because they didn't have enough hair the second test was with pubic hair, I about a month ago took one puff of mariujuana from my neighbor at a barbeque will that show positive? All I do is drink but in the last past year I have smoked before will they go back a year? What is the normal cut off date for a pre-employment hair test?