Delta Fingerprinting & Screening

Post-Incident Testing
OSHA permits business to test employees if employee drug use was likely a contributing factor to an incident, and a drug test would accurately identify the impairment caused by drug use.

Periodic Testing
Periodic testing is done on a scheduled and announced basis, such as quarterly or annually. This method ensures that all employees are tested on a regular basis and at the same time. The downside to this approach is that it is not as effective in screening out drug users. Employees can evade detection so long as they have enough willpower to abstain for a few weeks in advance.