That person must have been surprised when the substance passed the test.

VOA: special.2010.02.09

The ATP has refused to comment on Greg Rusedski's positive test for the banned substance, but insists it will enforce any punishment meted out to the player.

BBC: SPORT | Tennis | Tennis drug tests questioned

Its report also said Armstrong made a "financial agreement" to bury a positive test for a banned substance and accused the team of falsifying prescription records to cover corticosteroid use by Armstrong.

CNN: Lance Armstrong's legacy may withstand accusations

They are working with the Farmwatch scheme in the Test Valley to introduce a liquid substance which can be added to fuel to "chemically tag" it.

BBC: Heating oil 'tagged' to tackle rural theft in Hampshire