20. The use of CS dispersal canisters by GMP during Operation Shire was a focus of concern for the Inquiry. The CS dispersal canisters had not been through the approval process that includes the identification of an operational requirement by NPCC, testing by the Defence Science and Technology Laboratory (Dstl) and approval by the Home Secretary for use by police forces in the UK. 21. Greater Manchester Police has informed the Government that in anticipation of a recommendation of this nature, they have revised their Standard Operating Procedure (SOP) to set out that only Less Lethal Weapons and Specialist Munitions which have been approved by Defence Science and Technology laboratories (Dstl), NPCC and Home Office should be used. 22. GMP are updating the SOP now that the new Code of Practice for Armed Policing and Less Lethal Weapons has been published.