Wales' Commonwealth Games athletics squad, was provisionally suspended on Friday following a failed drugs test and misses the Glasgow Games as a result.
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hurdles champion became the second Welsh athlete to be forced out of the Games over an anti doping rule violation, after 800m runner Gareth Warburton was withdrawn before the Games.
Addressing a daily briefing in the host city, he said Williams' case was picked up in pre Games testing in the UK and was not part of the Games time testing programme.
He pointed to a "totally different" approach now being taken to testing, which does not simply focus on competition time, adding that t he emphasis was on working in collaboration with a number of other anti doping organisations.
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The company behind the Mountain Fuel supplements used by both athletes has launched an investigation to determine whether the product may have had a part in their failed tests.
for the image of the Games, Mike Hooper, chief executive of the Commonwealth Games Federation, said: "I don't Converse Beige believe it in any way puts a cloud over the Games.
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