It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
The trial of six green campaigners has collapsed after an undercover policeman who had infiltrated their group offered to give evidence on their behalf.
The six were charged with conspiring to shut down the Ratcliffe-on-Soar power station in Nottingham in 2009.
Undercover policing operations should have to be authorised in advance by a judge, the head of the Association of Chief Police Officers has said.
Sir Hugh Orde told a seminar change was needed to restore public confidence.
It follows concerns about ex-Metropolitan Police constable Mark Kennedy, who spent seven years posing as an environmental activist.
An MP who was involved in last month's G20 protests in London is to call for an investigation into whether the police used agents provocateurs to incite the crowds.
Liberal Democrat Tom Brake says he saw what he believed to be two plain-clothes police officers go through a police cordon after presenting their ID cards.