A drug test is considered more reliable and provides more accurate analysis results of an individual’s substance use. Many corporations and rehabilitation facilities prefer testing over screening. Drug screening is more cost-effective, and you receive results faster than a drug test. As well drug screenings could provide false-positive results for certain drugs. Aside from the normal requirements that may prospective employers require from prospective new hires, companies often require their employees to undergo regular urine drug tests to ensure that their current employees are not taking any drugs.