The practice of wiretapping has taken a new shape as technology has evolved. Telephone lines are no longer the only communication medium vulnerable to infiltration. E-mail, text messaging, and almost any form of online correspondence is susceptible to monitoring by a third party.
There have been a number of landmark court cases that have shifted the way government respects or rather, doesn't respect a citizen's privacy. Protected under the 4th amendment, which prohibits unreasonable searches and seizures, the right to privacy is not as ironclad as some may think.