Columbia subject headings:
Electronic surveillance--United States.
Telecommunication policy--United States.
Telephone systems--United States.
Harvard subject headings:
Criminal investigation--United States
Privacy, Right of--United States
Telecommunication--Law and legislation--United States
Wiretapping--United States.
Princeton subject headings:
Criminal investigation--United States.
Privacy, Right of--United States.
Telecommunication--Law and legislation--United States.
Wiretapping--United States.