If you were hoping that your heroin use was tough to catch, you could be in trouble. In October of last year the US Department of Transportation (DOT) changed their regulations for drug testing, lowering the cutoff levels for amphetamines and cocaine and adding the urine test for the heroin marker to its list of required tests. 
The addition of the test for heroin creates complications for employers who need to test their drivers to ensure safer highways. Heroin metabolizes quickly to 6-AM and then to morphine. Previously a test for heroin was only conducted after a positive result for morphine.
Testing laboratories, such as Quest Diagnostics, have updated their arsenal of tests to include an oral fluid test that can accurately reveal five times more heroin use in the general US workforce than previously believed. The oral fluid test is much easier to administer, making observation simpler, and oral fluid is more difficult to tamper with. According to the Quest Diagnostics Drug Testing Index™ oral fluid testing with more than 320,000 oral-fluid samples from the general U.S. workforce from January to June 2010, detected a marker for heroin use at a rate of 0.04% compared to the 0.008% positivity rate for urine testing. If you are a professional driver up for drug testing, it’s time to get clean!
Written by www.labtestingnow.com