Psychoactive THC from marijuana can stay in breast milk for six WEEKS after new moms quit using it, raising concerns the drug may alter babies' brain development

• Researchers looked at 25 pregnant women who had a history of marijuana use when admitted to hospitals for delivery
• Within two weeks of giving birth, the women had levels of tetrahydrocannabinol (THC) of 5.5 nanograms per milliliter (ng/mL) on average in their breast milk
• This is higher than the blood THC level of five ng/mL or higher needed to charge drivers with a DUI, in some states
• By six weeks post-delivery, the THC levels in breast milk had dropped to about two ng/mL, low but still detectable

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