World 400 meters champion Salwa Eid Naser has been cleared of committing an anti-doping rule violation after a World Athletics Disciplinary Tribunal dismissed charges brought against her for registering four "whereabouts failures."

The 22-year-old, who won gold at the World Championships in Doha last year, was charged and provisionally suspended by the Athletics Integrity Unit (AIU) in June.

According to World Athletics Anti-Doping Rules, any combination of three whereabouts failures – filing failures or missed tests – within a 12-month period by an athlete constitutes an anti-doping violation.

Athletes guilty of whereabouts failures could face two-year bans or a minimum of one year depending on the degree of fault.

In Naser's case, the disciplinary tribunal upheld three of the four AIU charges against her – a filing failure effective Jan. 1, 2019 and two missed tests, on March 12 last year and January 24 this year.

However, the tribunal found in Naser's favor with regard to a third alleged missed test on April 12, 2019, which resulted in the charges being dismissed because her three whereabouts failures did not occur within a 12-month rolling period.

"This was a case very much on the borderline and we hope the athlete will learn from the experience and heed the AIU's warnings," the tribunal said in a statement.

(Cover image: Salwa Eid Naser wins the women's 400 meters final at the IAAF World Athletics Championships in Doha, Qatar, October 3, 2019. /VCG)