As usual, they are going to ignore the evidence right under their noses on the surface, and go digging and drilling for it.
The surface of Mars is not a nice place for life.
There are cosmic rays that bombard the surface, and energetic particles from the sun, and the surface chemistry is very reactive so that any organic material would be rapidly oxidised.
The place to look for life is under the surface, and that's what this mission is doing that no other mission has.
Searching for life brings with it a new set of technological challenges. It is the reason why the rover has metal, not rubber, wheels, and why no oily lubricants can be used on its moving parts.
