Well now, here's some interesting information, "they" will have to argue their corner on this one?:-

http://www.bbc.co.uk/news/science-environment-24165219

On the face of it, the rover has shown that the remote sensors which "detected Methane" are way out, thereby casting doubt on all the other information "detected" by remote sensors?

On the other hand, it could just show that the instruments on the rover are not working correctly. You can't have it both ways but you just watch, "they" will find some reasons to "prove" that both the remote sensors and the rover were right.

Reading the news item you can sense the coming kerfuffle and get-out argument?