World 400m champion escapes ban after tester knocked on wrong door

• No punishment for Salwa Eid Naser over missed test
• Doping officer knocked on door containing gas canisters

The world 400m champion Salwa Eid Naser has escaped a doping ban on a technicality - after one of her missed drug tests was struck off due to a confused" tester knocking on a door containing gas canisters by mistake.

An independent tribunal found that a doping control officer who had come to test Naser in Bahrain in April 2019 had been thrown off by the unusual numbering system on the buildings around her apartment.