In the child welfare system, the threshold at which a drug test is considered positive varies widely from one jurisdiction to ...

A false positive test misidentifying baking soda as a mixture of fentanyl and horse tranquilizer is what landed a Pennsylvania man in a notorious New York prison for two weeks, the state Attorney ...

Can levalbuterol (Xopenex) cause urine to test positive for amphetamines? —William L. Powell, Orland, Calif. Drug screens falsely positive for amphetamines have been associated with use of the Vicks ...

A view of the East Block at San Quentin. Thousands of drug tests given to California inmates gave false results last year. Prison advocates worry that parole decisions were tainted. (Robert Gauthier / ...

This is The Marshall Project’s Closing Argument newsletter, a weekly deep dive into a key criminal justice issue. Want this delivered to your inbox? Subscribe to future newsletters. Last week, New ...

A new mother from Alabama is warning pregnant patients after she says eating an "everything bagel" for breakfast before giving birth to her second child upended her family last spring. It all stemmed ...

Democratic lawmakers are looking to address a controversial but commonly used drug test with an estimated false-positive rate of up to 40%. Rather than outright prohibit the tests, as other states ...

Thousands of inmates wrongly tested positive for opiate use inside California state prisons last year because of a laboratory mistake, and civil rights attorneys now worry many of them could be denied ...