How long does cocaine stay in the fetus before its born? how long does it stay in the poop when they test it

Months: Suspicion leads to meconium testing in a newborn as a more accurate reflection of past drug exposure than urine, that may only reflect a week or so.The material is built up over many months and the sensitivity of the test can pick up minute quantities deposited in the meconium as it forms.This reflects exposures from the preceding 3 months if not longer.