Wiretapping can actually threaten the success of intelligence services in preventing crime and helping to prove criminals guilty.  Regular use of wiretap and intercept evidence poses a danger to the evidence-gathering capabilities of intelligence agencies. There are concerns among experts that terrorists, far from being apprehended, will simply learn new techniques for ‘listening in to calls made over the internet’ [1] and know exactly who and what the intelligence services are monitoring. In this way, they could actually evade intelligence services and the police by using different forms of communication, such as encrypting messages or using disposable mobile phones. Revealing the capabilities of our intelligence agencies could create harms which far outweigh any potential benefits of intercept evidence [2] . This makes intercept evidence self-negating; if it is used, the very revelation of its use will alert criminals to it and make it vulnerable to manipulation and tampering – therefore, the evidence actually becomes less reliable and less effective [3] . Ultimately, it does not provide a tangible benefit.  [1]  , accessed 30/08/11  [2]  , accessed 30/08/11  [3]  , accessed 30/08/11