Need to know how many ways and how to get someone to get tested before my baby is born.?

So im 19 weeks pregnant and the dad is not involved well im trying to make sure he gets no custody because hes a druggie and not just weed hes been doing heroine. So i was wondering if you know a way i could make him go get tested now or have a cop force him to or a judge, so the judge can see that hes an unfit person for a baby to be around. Because if i wait hes going to stop before the baby comes then shave his head so they cant test anywhere on him and screw me over. Plus his parents smoke weed to and i just dont want my baby exposed to that stuff. Soooo any ideas on how i could do this?? Would there also be a way to get his parents tested to??? His mom is a social worker and she claims that shes going to beat me in court and i know its a very mean thing to do but i need to knock her down and get her introuble to. Cause you should not be able to work with kids and smoke weed. Thats not smart. So please help me.