R v EV & Others, Harrow Crown Court 2015

The National Crime Agency (NCA) used surveillance over a 6 month period to prosecute the Organised Criminal Network who were responsible for flooding London with hundreds of kilogrammes of Cocaine.

 http://www.standard.co.uk/news/crime/drugs-gang-who-flooded-north-london-with-cocaine-jailed-for-nearly-50-years-a3158036.html