A doctor would have been interviewed by police for rape and child cruelty over allegations a "truth drug" was used to carry out abuse at a hospital. The late Dr Kenneth Milner ran Aston Hall psychiatric hospital in Derbyshire from 1947 to the 1970s, which former patients described as "pure hell".
A report by police found allegations children were drugged to a zombie-like state, stripped and abused. Police said there would have been "sufficient evidence" to pursue a case. The Derbyshire force, under the direction of the area's safeguarding children's board, started an investigation in February 2016 after concerns were raised about the hospital which closed in the 1990s.
Most of the Aston Hall complex has been demolished, with a small part converted to flats Allegations first came to light in 2011 then 2014 and 2015. No allegations of sexual abuse were identified in 2011 by police.
Then in July 2014 an individual made an allegation of rape followed by another person alleging abuse at the hospital in September of that year.