Doping investigator: Evidence of tampering involving 12 Russian medalists from Sochi Olympics; 4 gold medals involved

LONDON (AP) Doping investigator: Evidence of tampering involving 12 Russian medalists from Sochi Olympics; 4 gold medals involved .

LONDON (AP) Doping investigator: Evidence of tampering involving 12 Russian medalists from Sochi Olympics; 4 gold medals involved .