Urine drug screening if commonly regarded as the better option for testing for impairment for drugs as it does have a longer detection time particularly for Cannabis. It is also the preferred option for blanket testing of staff when you are looking to gain a baseline to identify is you in fact have a drug problem in your workplace. Saliva however if still effective and less invasive than urine but is predominantly used as a test for impairment. The detection times for impairment is in some cases less than urine but it is still a useful approach to demonstrate to staff that your organisation is serious about safety in your workplace when it comes to drugs and alcohol.