Catlin also identified the first reported designer anabolic steroid in sport, norbolethone.

He told Sports Illustrated last October that he unknowingly used a designer steroid on his right knee in 2002.

It was brought to market, instead, in a clandestine fashion as a "designer steroid."

Methasterone resurfaced in 2005 as a "designer steroid".

And before he was linked to a designer steroid called THG.

If you're using a designer steroid and you have four tests a year, you might get away with it once.

No doubt unscrupulous chemists are cooking up the next designer steroid and devising the most efficient way to code-break the latest testing technology.

Its androgenic properties are more exploited in a "designer steroid", the derivative tetrahydrogestrinone.

Published reports said he had tested positive for THG, the new designer steroid.

He is the scientist who identified the designer steroid, known as THG, that is at the heart of the scandal.