In March 2015, Cabinet Office papers were released confirming that Prime Minister Margaret Thatcher was made aware of allegations against Smith before he was knighted in 1988, although she gave him the "benefit of the doubt" because the Director of Public Prosecutions had previously investigated him and had decided not to prosecute him due to lack of evidence. Shortly after, a BBC investigation on Newsnight revealed that Smith had been arrested in the early 1980s in relation to his participation in a paedophile ring, but a high-level cover-up reportedly led to him being released within hours, the evidence destroyed and the investigating officers prevented from discussing the matter under the Official Secrets Act. Theresa May, the Home Secretary, called for immunity for whistle-blowers in the case. Reports also emerged of Smith's arrest by Northamptonshire Police, where he was again released in mysterious circumstances.
