Any drug in
fested by mama after week 20 is supposed to show up in
baby's meconium. Not all hospitals test
dium without reasonable cause though. If the drug
use is in
your medical record or if your or baby is actin
g suspiciously, then there will be a test for sure. But I've heard some hospitals tests all meconium. For the safety of your baby, you should be honest with your OB so that you can withdrawal properly at the right Time
and all precautions are taken for baby's sake.