NASA has announced that the properties of a rock in Jezero Crater qualify as a potential biosignature. The NASA Astrobiology Roadmap defines a biosignature as “an object, substance, and/or pattern whose origin specifically requires a biological agent.” By that standard, a confirmed biosignature would be as close as we can get to proof of alien life (though of course there is no final “proof” in the scientific method). 

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Chad Pozarycki worked at NASA Goddard on the Curiosity SAM team and did his PhD at Georgia Tech on detecting organic biosignatures in Martian planetary analogs. He is currently CEO of Deleon Technologies, Inc.