Those are bad examples of contaminants as they all are safer than cocaine. Cocaine is one of the most dangerous hard drugs with only things like heroin and fentanyl being more dangerous. I am not saying it should be illegal mind you. It’s just interesting to think about. If you were going to start getting hard drugs legalized it’s maybe not the best place to start despite it’s relative popularity. I would maybe start with MDMA or Ketamine as they are generally safer and have actual medical uses.