In Scotland, McKinnon arranged for the drugs to be sold on from his home in Niddrie, Edinburgh.
Strangers are starting to recognize Mr. McKinnon in public.
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Karen Todner, Mr Tappin's UK lawyer, who also represented computer hacker Gary McKinnon in his successful fight against extradition, said 98% of people who enter the US justice system enter into a plea agreement.
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In one case, McKinnon allegedly crashed computers belonging to the Military District of Washington.
In August 2008 Mr McKinnon was diagnosed with Asperger's syndrome - a form of autism.
David Burrowes, who has campaigned in support of Mr McKinnon, called for a Commons statement once Mrs May had made a final decision.
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In February the Crown Prosecution Service (CPS) turned down a request from his lawyers for Mr McKinnon to be prosecuted in the UK on lesser charges.
At a meeting of the Commonwealth Ministerial Action Group in London this week, Don McKinnon, the Commonwealth secretary-general, said that if the election were to be held in June, international observers would have to arrive at once.
Mr McKinnon was arrested in 2002 and again in 2005 before an order for his extradition was made in July 2006 under the 2003 Extradition Act.
Mr McKinnon, arrested in November 2002, has always maintained that he was motivated by curiosity and that he only managed to get into the networks because of lax security.
Mr McKinnon lost appeals in the High Court and the House of Lords against his extradition, but two years ago a High Court judge ruled Mr McKinnon would be at risk of suicide if sent away.
McKinnon admitted being concerned in the supply of heroin at his home in May 2011.
Glasgow-born Gary McKinnon could face life in jail if convicted of accessing 97 US military and Nasa computers.
It is now up to British prosecutors to decide if McKinnon should face charges in the United Kingdom.
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It was on that basis that McKinnon made his appeals in Britain.
The Crown Prosecution Service says Mr McKinnon will not face charges in the UK. Director of Public Prosecutions Keir Starmer QC says the chances of a successful conviction are "not high".
Grant McKinnon, a poster dealer in San Francisco, explains that in the rock'n'roll field, many of the original artists, printers and negatives are still around, so primary-source knowledge is fairly easy to come by.
Mr McKinnon has previously lost appeals in the High Court and the House of Lords against his extradition, but two years ago a High Court judge ruled Mr McKinnon would be at risk of suicide if sent away.
Were he to be tried and convicted, McKinnon could have faced 60 years in a U.S. prison.
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McKinnon was on the brink of extradition in August 2008, when the European Court of Human Rights in Strasbourg, France, refused to reconsider the decision to send him to the United States, effectively clearing the way for his transfer.
Mr McKinnon, who hacked into the US computers in 2002, has been fighting extradition since 2006.
If there is no UK prosecution, Mr McKinnon would inevitably be extradited to stand trial in the US, the judges heard.
Mr McKinnon, who was arrested by British police in 2002, has already appealed unsuccessfully to the House of Lords and the European Court of Human Rights to avoid extradition.
"The years of 300% annual increase in the stock price are probably over, " says Paul McKinnon, Dell's head of personnel.
Mr McKinnon first lost his case at the High Court in 2006 before taking it to the highest court in the UK, the House of Lords.
Mr McKinnon's mother Janis Sharp said that while in opposition both the Conservatives and Liberal Democrats had condemned the use of the extradition treaty in her son's case.
We completely understand that Gary McKinnon stands accused of a very important and significant crime in terms of hacking into vital databases.
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Mr McKinnon's supporters say he ought to stand trial in Britain (if at all) because of his health, which would not stand up to an American trial and possible imprisonment.
Mr McKinnon, who has Asperger's Syndrome, faces trial in America.
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