A study published this month suggests popular baby washes cause newborns to mistakenly test positive for exposure to marijuana.

Researchers studied the phenomenon after doctors at University of North Carolina (UNC) Hospitals noticed a spike in false positive results for THC — the active ingredient in pot — during routine urine tests.

The study found commonly used baby washes, such as Johnson and Johnson’s Head-to-Toe and Aveeno Soothing Relief Creamy Wash, are to blame for the faulty test results.

Scientists say they don’t know what is causing the faulty results, but did identify some of the detergents in the washes that are to blame.

Study researcher Dr. Catherine Hammett-Stabler, professor of pathology and laboratory medicine at UNC Hospitals in Chapel Hill, said correctly identifying illegal drug exposure in newborns “is critical to ensure both protection of the child and support for the family.”

The authors said the purpose of the study is to inform health-care providers and laboratory technicians, and to advise that positive urine screens for THC need to be confirmed.

The study was published in the journal Clinical Biochemistry.

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