Others claim that it helps them attract the best applicants, leaving drug users to apply at companies that do not screen for drugs. Home Depot tests all of its more than 90,000 employees nationwide for drug use before they are hired or promoted. Potential employees who test positive for illegal substances are not hired, and current employees who test positive are fired. They contend that a decade of drug testing has failed to produce evidence that testing curbs workplace problems and drug abuse. Greenberg agrees that there is not enough evidence to show if testing cuts down on overall drug use, but he says it does let the company identify specific drug users.
Most calls are from people trying to beat drug screens.
Some callers try to dilute the marijuana metabolites in their system with fluids, while others swap urine with someone else or add chemicals to their urine. We get calls from people who say, 'I'm about to drink a quart of bleach. It speaks volumes about people's desperation to pass these tests.