The Regulation of Investigatory Powers (Directed Surveillance and Covert Human Intelligence Sources) (Amendment) Order 2012, SI 2012/1500 (“the 2012 Order”), made on 11 June 2012 and coming into force on 1 November 2012, restricts the circumstances in which local authorities may authorise directed surveillance under the Regulation of Investigatory Powers Act 2000 (“RIPA”). The 2012 Order amends the Regulation of Investigatory Powers (Directed Surveillance and Covert Human Intelligence Sources) Order 2010, SI 2010/521 (“the 2010 Order”), which prescribes the offices, ranks and positions of the individuals within a public authority who have power to grant authorisations for the carrying out of directed surveillance, as defined by s26(2) of RIPA, and sets out the restrictions on the circumstances in which authorisations can be granted.
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via Kevin Macnish
The best and most obvious answer is to make them obtain warrants if they want to do any spying, otherwise leave it to the police like it should be.