Quincy spends the whole episode trying to locate an injured person who occasionally calls his sister. For some reason it never occurs to him to get the police to contact the phone company and request a list of all calls to the sister's phone. It would have been relatively easy, and much quicker, to locate him. Even stranger, the police had assisted Quincy with monitoring the phone conversation between the party in question and the sister, and never took the initiative of contacting the phone company on their own.