The psychoactive ingredient in marijuana can remain in breast milk for up to six weeks after mothers quit using the drug, a new study suggests.Researchers found levels of tetrahydrocannabinol (THC) were as high as 5.5 nanograms per milliliter (ng/mL) two weeks after women gave birth.This is higher … [Read more...] about Psychoactive ingredient in marijuana stays in breast milk for 6 WEEKS