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From "Just say NO" to "Just say KNOW". What happened when we put fentanyl test strips to the test.

Fentanyl test strips used to be illegal in California. Now, state law requires them on community and state college campuses and they're popping up everywhere from vending machines to bars.

They're intended to help young people avoid fentanyl-laced counterfeit prescription pills and tainted recreational drugs. But as fentanyl test strips are normalized – from high school to college to bachelor parties – experts warn test strips alone can provide a false sense of security, and in some cases do more harm than good.

We put fentanyl test strips to the test, and what we found could save someone you know.

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