IBF back Peterson over failed drugs test

Lamont Peterson has been allowed to keep his IBF light welterweight title, despite failing a drugs test.

The American won the IBF and WBA belts from Amir Khan in his home town of Washington via a controversial split decision in December.

The WBA stripped Peterson of the title and reinstated Khan, who lost a unification bout to Danny Garcia last month — a fight arranged after a rematch with the Briton scheduled for May was called off by the Nevada State Athletic Commission after Peterson tested positive for synthetic testosterone.