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US Olympian expelled after testing positive for marijuana he 'accidentally' ate

US judo fighter Nick Delpopolo was disqualified from the London Olympics after he failed a drug test and admitted he accidentally ate marijuana-laced food.
Nick delpopolo
Nicholas Delpopolo visits the USA House at the Royal College of Art on August 2, 2012 in London, England. (Joe Scarnici/Getty Images)

American judo fighter Nicholas Delpopolo was expelled from the Olympic Games on Monday after testing positive for marijuana, the Associated Press reported.

Delpopolo said he accidentally ate the drug before arriving in London. He is the first athlete at the London Olympics to fail an in-competition doping test, the AP wrote. Four other athletes were caught before competition began.

He insisted he had not known the food contained the banned substance, the BBC reported. 

The International Olympic Committee said Delpopolo "indicated that he was embarrassed by this mistake" and apologized to the United States Olympic Committee and his team-mates.

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The BBC wrote the 23-year-old had finished seventh in the men's 73kg competition and was tested after he lost to Mongolian Nyam-Ochir Sainjargal in the repechage stage.