hesitating, saying it has to wait for a court ruling later this week on an appeal by pole vault star yelena isinbayevaong others to, get the track and field ban overturned. that shouldn't make a difference, says u.s. anti-doping chief travis tygert. >> no state or sport system should ever attempt to do this again. i think that means you have to exclude the russian delegation from the olympic games. >> reporter: what the russians did was cheat by using cold war-style spy craft to compromise the olympic drug testing system. right next door to the lab where the athletes urine samples were tested, the f.s.b., the old k.g.b., moved in. a whole was drilled through the wall. samples from the russian athletes that had tested positive for drugs were slipped out, and they were replaced with clean samples that were slipped in. which is why the lawyers are now involved. in the meantime, the i.o.c. says it will retest the samples of all the russian athletes who were in sochi, but the biggest sanctions, scott, the ban from rio, it's not ready to do that yet. >> pelley: mark phillips, thanks, and we'll be right back