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Rollins' suspension, backdated to December 19, 2016, will not affect her Olympic gold medal, which led a historic USA sweep of the event in Rio de Janeiro.

USADA confirmed that the Olympic champion did not fail any tests, but "the combination of three Whereabouts Failures within a 12-month period constitutes a rule violation".

The sprinter was a member of the USADA registered testing pool, which consists of a select group of athletes who are subject to certain whereabouts requirements in order to be located for out-of-competition testing.

Rollins underwent eight out-of-competition tests previous year and "at least" 16 tests overall, according to her attorneys, and never tested positive.

She was also banned for a year but returned in 2007 to win the 400m at the IAAF World Championships in Osaka only 24 days after her suspension ended.

As a result of this drugs ban, Rollins, 25 wil miss the World Championships in London in August. She failed to update here whereabouts when going to The White House to meet President Barack Obama following her Olympic triumph.

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In its decision, the panel acknowledged it was "a hard case because it involves the imposition of a serious penalty on a brilliant athlete who is not charged or suspected of using banned substances of any kind". This is a very unpleasant experience, but I am able to see where errors were made. Her clean tests included an out-of-competition test on May 3, 2016 (six days after Incident 1) and an out-of-competition test on October 14, 2016 (31 and 17 days, respectively, after Incidents 2 and 3). Her ban runs from September 27th a year ago, for 12 months. "I will accept the sanction and prepare myself for my return in 2018". The tester showed up at her home at 7:08 am.

Another Briton, Sir Mo Farah, faced the threat of a suspension when he missed two out-of-competition tests in a year before London 2012, where he won gold medals in the 5,000m and 10,000m.

Her management agency Stellar Athletics pointed out that Rollins had received the minimal suspension possible after a hearing before the American Arbitration Association (AAA).

In a statement posted on her official Instagram account, Rollins said: "Unfortunately I will not compete in the 2017 season, due to three missed tests with USADA".

The USADA agreed that Rollins is not suspected of doping, and the panel wrote that "she shows no evidence of avoiding testing, masking drug use, or using drugs".