The World Anti-Doping Agency also passed a rule today that offered athletes possible immunity from punishment in return for "substantial" information on doping, giving cyclists an incentive to testify in a planned inquiry into their sport's drug-stained past.
"I guess it's founded on the question, If you can bring about a greater good with the cooperation you give, then there ought to be some encouragement for you," outgoing World Anti-Doping Agency President John Fahey said.
"I certainly hope that the higher sanctions become a much more regular fact of life," Reedie said, immediately endorsing the tougher bans.
The code will take effect January 1, 2015, in time for the 2016 Olympics in Rio de Janeiro. It will ensure that athletes found guilty of intentional doping miss the next games, a position strongly backed by the International Olympic Committee.
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Bach called for more research and technological developments.
The move to four-year bans, seen as the most obvious new deterrent, was joined by a clause that will allow athletes to escape any sanction if their information on doping is valuable enough. It can be used in the cycling inquiry, planned for next year, on a legal principle that it is a rule about to come into effect.
The principle will apply only to current cyclists, not banned American rider Lance Armstrong.