Can you trust negative drug test results anymore? The Internet is flooded with products, more than 400 by one count, that help employees and job candidates cheat on drug tests. The easiest tests to beat are urine-based tests, so the federal government is looking to add hair and/or saliva testing, which can be harder to cheat on. Advice: Talk with your drug-test administrator about the potential for cheating on your drug tests and ways to stop it. Also, don't take the "one and done" approach; use random tests and reasonable-suspicion tests, which are harder for the employee to plan for.