Instead, he may try to make his fourth Olympic team.
Alptekin's Turkish countrywoman Nevin Yanit is also suspected of cheating.
Thirty-nine runners took to the streets this morning to try it out.
She will be running on parts of the Olympic Marathon course.
She hopes to qualify for the U.S. Olympic Marathon squad.
The Ethiopian champion has been battling injury for over a year.
A former British Olympian convinced him to come to England.
One of America's fastest milers admits he wasn't very good when he first started.
Both athletes fielded questions ranging from debut marathons to the secrets of longevity.