It is the International Testing Agency (ITA) that will do the re-tests from the 2014 Winter Olympics, states AFP and the site Insidethegames.
They should be ready by mid-2021 so that any penal processes can be completed before the Beijing Olympics in February 2022.
It was after the Olympics in Sochi that the great doping scandal in Russia was revealed, that the country conducted a comprehensive and state-sponsored doping program.
It included the exchange of doping samples during the Olympics in Sochi.
The scandal led to the Russians' doping tests in Sochi being retested.
- ITA will now extend the re-tests to all nationalities and primarily test more than half of the doping tests, says ITA.
The ITA says that the analysis methods of doping tests have improved in recent years, especially when it comes to tracking anabolic steroids and hormones, which makes it possible to detect doping that could not be detected during the Olympics in Sochi.