Bradford's Ryan Hudson has been banned for two years after being found guilty of providing a sample containing the banned steroid stanozolol.
Hudson has yet to play for Bradford
The 25-year-old, who joined the Bulls from Castleford last year, will also have to pay costs of £293.
The Rugby Football League has also announced that London's Danny Williams has been found not guilty of refusing to provide a sample on 10 December.
The pair attended a meeting of the RFL Advisory Panel in Leeds.
The suspension, which is backdated to 20 January, is in line with the World Anti-Doping Agency code.
Chairman of the RFL panel, judge Peter Charlesworth said: "Rugby League complies with the Wada code and there is a mandatory sentence for this offence of two years."
Bradford are now left without a specialist hooker, with Hudson having been brought in to replace James Lowes following his retirement in 2003.
Hudson captained Yorkshire to a 56-6 victory over Lancashire in the last Origin Game and was included in the Great Britain squad for the 2003 Ashes Series, although he never won a cap.
He was said to be "devastated" by the outcome and is due to meet with his solicitor and his father, who acts as his agent, on Thursday to discuss whether to lodge an appeal.
A Bulls spokesman said: "The Bradford board will meet to discuss the verdict before making any comment."
Judge Charlesworth added that with the Williams case, a "misunderstanding" was part of the reason he was not found guilty of any offence.
"Danny Williams was not at the time a registered player with the Rugby Football League and, therefore, not subject to the doping control regulations. Also he was not under contract to any Australian club," said the judge.
"We decided at the very least that there was a misunderstanding as to whether his failure to take the test was to be treated as the offence of 'refusing', as opposed to him having been wrongly identified as liable to take the test."
Meanwhile, former Halifax forward Ged Corcoran was banned for three months after being found guilty of providing a sample containing the cold-cure ephedrine following the European Nations Cup Final on 7 November.
The 21-year-old, in the Ireland team beaten by England, was released by Halifax at the end of last season and has been playing for French side Limoux.
Cramer added: "Ged is absolutely gutted - he received support from his old Halifax coach Anthony Farrell and Ireland coach Daryl Powell.
"His career is now in jeopardy because we don't know what Limoux are going to do."