Article: Caller ID: maintaining investigative security.

The telephone has become such a staple of modem life that few people give it a second thought. When callers pick up the receiver, it is doubtful they consider the millions of signals being routed through switching stations that their call is about to join. They just know that when they want to check in with a family member across town or a business associate across an ocean, they only need to pick up the telephone. Even when power goes out in a community, the telephones generally continue to work. So, it might be easy to take this workhorse of the information age for granted.

However, advances in telephone service options - most notably caller identification services ...

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