Intelligence Services and General Warrants
GCHQ and MI5 Cannot Rely on General Warrants The High Court ruled on January 8th, 2021 that it was unlawful for the GCHQ and MI5 to use warrants issued under Section 5 of the Intelligence Services Act 1994 (ISA) to interfere with the property—including computers—of multitudes of people based on a single warrant. The High Court quashed a 2016 decision by the Investigatory Powers Tribunal (IPT), and ruled that section 5 of the Intelligence Services Act (ISA) 1994 does not permit the issuing of general or thematic warrants to authorise property interference and certain forms of computer bugging, monitoring and hacking.