Seems as if NASA blew it again... so much for alien life forms.
When I read about their "discovery" I had a small smidgen of doubt, mainly because I know that South African gold mines use a arsenic tolerant bug developed by the Microbiology Dept of Stellenbosh University under Prof. Douglas E. Rawlings, this bug has been un use for many years in fact in the gold extraction process. Australia also developed similar technology. Something did not ring true... I suppose the NASA team never used Google...
I have a feeling NASA was using this to garner favor for more funding.
This is not the only junk science NASA has had a part of... the AGW scandal has used false data from faulty satellites to try an prop up their failing cause among others.
A real shame that an organization that managed to put a footprint on the moon is now stooping to cheap sensationalism to stay afloat. Just like the Global Warming Fanatics...
In fact organisms that thrive on Arsenic are more commonplace than we think. Life has a way of finding the strangest places to thrive in it seems.
"Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool." Richard Feynman