NEW DELHI (AP) — India's sports ministry says Olympic boxing medallist Vijender Singh has tested negative for banned substances after police claimed last month he was a heroin user.

The ministry said in a statement on Tuesday that a "full menu test was conducted which included testing for psychotropic substances."

The National Anti-Doping Agency undertook the out-of-competition tests at Vijender's request after police in the northern state of Punjab claimed Vijender's name came up during an investigation into a heroin haul worth more than $25 million.

Vijender, a middleweight bronze medallist at the 2008 Beijing Games, refused to undergo tests by police as there was no case against him, but agreed to being tested by NADA.

Athletes are normally tested for recreational drugs only during events, while out-of-competition tests are conducted for performance-enhancing substances.