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It's worth noting that they spend millions and billions of dollars on Mars Landers to quote look for evidence of prior life but they have never put the equivalent of a $20 children's microscope on any of the Landers with enough magnification to actually look close up at the dirt and see if there are actual bacteria or amoeba running around.

The closest they came was putting something called the hand lens which has about the equivalent magnifying capability of a magnifying glass you would hold in your hand. Yet they'll spend billions to put these fancy chemical experiments to try to detect signs of Life via some gases they give off or to determine whether or not there is enough methane or something else to make an argument that there might have been life yet they won't put a simple $20 children's microscope in front of a camera on a Mars lander because that would show them immediately that there is bacteria in the soil and that would change everything in terms of their ability to explore and it would cut off funding for more missions to determine if there is life.

And the Mars Viking Landers in 1976 to Landers landed on Mars and each one found signs of Life that was determined at that time to be enough to declare there was life and immediately after it happened a bunch of scientists realized that would mean the end of the search for Life NASA missions and they came up with a bunch of cockamamie excuses why the experiments that they determined were good enough to prove life suddenly weren't good enough anymore. and even those excuses were debunked by running more experiments with the same equipment on Mars to prove that it wasn't a chemical reaction and that the life itself was seasonal etc etc yet if you ask any NASA sign is today they'll repeat the old nonsense arguments about why the experiments which proved multiple times they found life in two different places on Mars were not good enough.

Gillevin.com who designed the actual experiments has a section on his page since he died called Mars research which explains it all and goes over the fact that all the arguments against it being life were debunked.