Drug testing is done for a variety of reasons:  as part of the pre-employment screening process, random testing while employed or in a diversion or probation program, post-accident for a DOT-regulated job, reasonable suspicion of use while at work, return-to-work after completing a program, follow-up testing, personal or private use, court-ordered screening, drug-free school programs, and many more. The categories below summarize various testing options at Oris.