The last robotic to land on Mars was Phoenix (landed August 2008). It obtained some info but I was disappointed that one of the most important gizmos didn't really return good meaty data.
From Wiki ..
Quote:
On May 29, 2008, electrical tests indicated an intermittent short circuit in TEGA,[87] resulting from a glitch in one of the two filaments responsible for ionizing volatiles.[88] NASA worked around the problem by configuring the backup filament as the primary and vice-versa.
On June 11 the first of the eight ovens was filled with the a soil sample after several tries to get the soil sample through the screen of TEGA. On June 17, it was announced that no water was found in this sample; however, since it had been exposed to the atmosphere for several days prior to entering the oven, any initial water ice it might have contained could have been lost via sublimation.
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So it kind of even missed detecting H2O. It landed in the Northern polar region where they expected heaps of frozen H2O.
Inconclusive results, just for H2O detection !!
Cheers