A care worker at a special school in Buckinghamshire has been jailed for 10 years for raping boys in his care.
Anthony Bulley, 39, preyed on boys aged between 11 and 14 while he was employed as "head of care" at Stony Dean School in Amersham, Oxford Crown Court heard.
Jailing him, Judge Julian Hall told Bulley: "You have polluted the waters of decent, hard-working teachers."
Bulley admitted six offences, including rape and sexual assault, on four boys between 2002 and the end of 2004.
Another 11 counts, involving three other boys, were denied and allowed to lie on file by the CPS.
The court was told how he lured the boys into his flat, which was attached to a boarding house.
Bulley was banned from working with children for the rest of his life.
He will also be on licence for the next 15 years, the judge said.