The IBSF had issued provisional suspensions to the four, including Olympic gold medalist Alexander Tretyakov, on December 30 after the International Olympic Committee opened an investigation into apparent tampering with drug test samples.
However, the IBSF said that a hearing on Tuesday found there is so far "not sufficient evidence" to justify provisional suspensions, which keep athletes out of competition for the duration of a doping investigation.
For the first time, the IBSF has also identified the competitors involved. Besides Tretyakov, they are Elena Nikitina, Olga Potylitsina and Maria Orlova, who finished third, fifth and sixth respectively at the 2014 Olympics.
The accusations against them followed the publication of World Anti-Doping Agency investigator Richard McLaren's report accusing Russia of operating a state-sponsored doping system in which top Russian athletes' samples were secretly swapped for clean ones during the 2014 Olympics in the Russian city of Sochi.
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