In
Northern Ireland, the term "supergrass" especially refers to arrested paramilitaries who divulged the identities of their compatriots to the
Royal Ulster Constabulary, possibly in exchange for immunity from prosecution. Sir
John Hermon, former Chief Constable of the
Royal Ulster Constabulary, did not deny reports that inducements were paid but denied figures as high as £50,000 were involved. The use of the term in Northern Ireland began with the arrest of Christopher Black in 1981. After securing assurances that he would have protection from prosecution, Black gave statements which led to 38 arrests. On 5 August 1983, 22 members of the
Provisional IRA were sentenced to a total of more than 4,000 cumulative years in prison, based on Black's testimony alone (eighteen of these convictions were overturned on appeal on 17 July 1986). By the end of 1982, 25 more "supergrasses" had surfaced contributing to the arrests of over six hundred people from
paramilitary organizations, such as the Provisional IRA, the
Irish National Liberation Army (INLA) and the
Ulster Volunteer Force. On 11 April 1983, members of the
loyalist Ulster Volunteer Force were jailed on the evidence of supergrass Joseph Bennett. These convictions were all overturned on 24 December 1984. In October 1983, seven people were convicted on the evidence provided by supergrass
Kevin McGrady although the trial judge Lord Chief Justice Robert Lowry had described McGrady's evidence as "bizarre, incredible and contradictory". The last supergrass trial finished on 18 December 1985, when 25 members of the INLA were jailed on the evidence of
Harry Kirkpatrick. Twenty-four of these convictions were later overturned on 23 December 1986. Many convictions based on supergrass testimony were later overturned, and the supergrass system was discontinued in 1985 until reintroduction in 2011. The first supergrass trial in 26 years began on 8 September 2011 for the murder of
Ulster Defence Association (UDA) member
Tommy English. In Northern Ireland the term "
tout" is a popular alternative to "grass". The
Police Service of Northern Ireland have refused to use this term and prefer the term
assisting offender, based on the legislation that enables the use of such evidence. ==Other usages==