Police need probable cause to hold someone or arrest them. According to the Chief, they didn't have it. They noted the statements from the girlfriend didn't match the physical evidence. IMHO, the failure is in the mental health part. The FBI and APD did what they were supposed to do, get someone who appears mentally ill to a mental health facility for observation and treatment by a DOCTOR. FBI/Police are not medical doctors. As far as the gun, they followed the rules to hold it, again, they denied him picking the gun up the first time, and then the had to let him have it back.   Police/FBI followed the law...