The police knows that there are people doing drugs and I'm pretty sure the police know about this site. For those not using a .tor and sitting at home, they CAN get to your IP address even using your personal smart phone using IP Triangulation. But, this site is supposed to be for harm reduction. People are going to do the drugs, I would say that this site is like giving out clean needles and a safe haven to keep you alive. In the little bit of time that I have been here, I have seen users try and avert suicidal people, as well as telling people it's not a good idea to do (blank). Also, personal experience and help with different meds combo are definitely helpful. I don't think the cops would want to interfere with something helpful even if there end game is to end drug use. In short, I think you are fine. Stick to the rules and smooth sailing shall come your way!