In the United States for instance , the Communications Assistance For Law Enforcement Act ( CALEA ) requires that all telephone and VoIP communications be available for real - time wiretapping by Federal law enforcement and intelligence agencies .
The official and unofficial tapping of telephone lines is widespread .
In the United States the Communications Assistance For Law Enforcement Act ( CALEA ) requires that all telephone and VoIP communications be available for real - time wiretapping by Federal law enforcement and intelligence agencies .
The official and unofficial tapping of telephone lines is widespread .