There has been a great deal of interest in the use of lie detector (polygraph) test in the Canadian investigation into abuse in State institutions.
100% of the 180 accused Canadian carers passed, not one abstained. Of the 1489 'victims', redefined as claimants, only 3 were prepared to take the tests, despite offers of increased compensation, & they all failed ! In other words not one of the 1489 complainants passed the test.
Perhaps the UK Government should require complainants and the accused to undergo polygraph lie detector tests.
Polygraphs are 80-90% accurate so if large numbers of people undergo testing you get very good data of collective guilt/innocence. Individually they are not so good.