By Duncan Mackay

Dwain Chambers_running_in_Istanbul_March_2012April 29 - Former drugs cheats, including Dwain Chambers, will be eligible to compete for Britain at London 2012 after the Court of Arbitration for Sport (CAS) overturned the British Olympic Association's lifetime ban on offenders.

CAS is due to formally announce its decision at 1500 BST tomorrow.

The Lausanne-based panel have, as expected, ruled that the BOA bylaw which stops athletes convicted of serious drugs offences representing Britain at the Olympics is against the rules of the World Anti-Doping Agency (WADA) and must be scrapped.

WADA had challenged the ban at a hearing in London last month claiming its controversial anti-doping bylaw non-compliant with its code, which the BOA are signatories too.

It followed a CAS decision last October that the International Olympic Committee's controversial Rule 45 - or "Osaka Rule" - banning convicted drugs cheats from future Games was illegal.

The decision will leave the way clear for Chambers, banned for two years in 2003 after testing positive for a cocktail of anabolic steroids, to compete in the 100 metres at London 2012 and also join the 4x100m relay team.

It also opens the door for cyclist David Millar, banned for two years in 2004 after admitting taking the banned blood-boosting drug Erythropoietin, to compete.

"The British Olympic Association can confirm that today, it has received from the Court of Arbitration for Sport the written decision in the arbitration between the BOA and the World Anti-Doping Association," the BOA said in a statement.

"As the decision is to be announced first by CAS, and out of respect for CAS and the Arbitration Panel, the BOA will be offering no comment today."

When they receive official notification of the decision, the BOA will formally remove the bylaw - which had been introduced in 1992 - at a full Board meeting, paving the way for the likes of Chambers and Millar to be selected if they reach the qualifying criteria.

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