How long will it take for an opiate... preferably heroin to get out of a baby's stool?? If that's even what they test in the hospital. My sister in law is due in about week & she just stopped taking heroin yesterday. I don't like the idea she did it her whole pregnancy. I'm not going to start a family fight over it. But I don't want my niece to be taken away from her or my brother. So I figured this would be the best place to ask instead of calling up a random doctor or hospital. Thank you so very much for your help!!