Canada's so-called "Prince of Pot" has been brought to the US where he is expected to plead guilty to selling marijuana seeds to US customers.
Marc Emery allegedly sold millions of marijuana seeds around the world by post.
He was ordered extradited by Canada's Minister of Justice Rob Nicholson on 10 May.
Mr Emery arrived in Seattle, Washington state, on Thursday and is expected to plead guilty on Monday.
Richard Troberman, Mr Emery's attorney, told the Associated Press news agency that his client would plead guilty to one count of conspiracy to manufacture marijuana in exchange for an agreed sentence of five years in prison.
Mr Emery, a resident of Vancouver, British Columbia, said he had made $3m (£2.4m) a year before his arrest in 2005.
His seeds were allegedly traced to illegal cannabis-growing operations in Indiana, Florida, Tennessee, Montana, Virginia, Michigan, New Jersey and North Dakota, according to the US Drug Enforcement Administration.
