In the article it states that the cross contamination arguments applied to the nasa rocks because the astronauts couldn't get the lid back on the sample contain

In the article it states that the cross contamination arguments applied to the nasa rocks because the astronauts couldn't get the lid back on the sample containers. There could be contamination of the Russian samples, but the same argument about containers being improperly sealed doesn't apply unless there is some sort of evidence that it should.