i was fired for testing positve for cocaine. i had them retest and they said still showed cocaine, I went through the program they suggested ( a two day class) i also took a drug test when they fired me two days after the first test that showed all negitive. I recieved a letter to release me to go back to work and that they had released me to go back to work after completing drug rehab for a positive test of thc. Any idea how this could happen?