In Germany the Berlin Police admits having wiretapped 1,100 telephone mainlines in 2007, thus they listened to 1million phone calls. In 2006 only 540 mainlines have been tapped. The main entertained suspicion for eavesdropping was drug related crime.
The police explains that a large number like 1,100 mainlines was necessary, because the 500 assumed suspects are using more than one phone. One question remains: can police decide what reasonable suspicion is – or who does?