drug tests

Employers can still give drug tests or fire an employee if they are acting under federal guidelines, or if an employee consumed marijuana at work or while performing work-related duties.

Elizabeth Moreno got hit with a $17,850 bill from a Texas lab after leaving a urine sample at her doctor's office. The lab had tested the sample for a wide range of legal and illicit drugs.

Police departments across the country use inexpensive field tests to quickly screen for drugs. But the kits create a lot of room for error — with troubling consequences.