UK: Home Office: Intercept as Evidence
17 December 2014
"Interception of communications is one of the most important techniques used in the investigation of terrorism and serious and organised crime. But interception is an intrusive power and is therefore only used by a small number of UK security and law enforcement agencies for a specified range of purposes. While interception supports criminal investigations by providing vital intelligence, the law currently prohibits the use of intercept material as evidence in criminal proceedings."
See the full-text:
Intercept as Evidence (CM 8989, pdf)