[callisto]

They may not even find traces of water. This was discovered from orbit, not from actual samples.

Indications are that 3 different instruments have detected the signs. That's a pretty good start at making an estimate in my opinion.

[Balto_Boy]

Indications are that 3 different instruments have detected the signs.

Do these instruments use different methods or the same, and do any of them test actual samples?

That's a pretty good start at making an estimate in my opinion.

I would agree, except the findings are being reported along side a call to go to Mars. Not that I'm opposed to exploration, but let's do it for the right reasons, IE. to see what's there, not to pour money into trying to prove the theory of life on Mars.