Sammy Hunter Jr. admitted he made mistakes. He was addicted to drugs, did not take medication for his schizophrenia and — worst of all — almost hurt his son while high on marijuana laced with PCP.

Various factors influence how quickly a person’s body processes phencyclidine (PCP). Generally, the drug’s half-life is 21 hours. Different tests can detect PCP, and it may be detectable for up to 90 ...