"During the past few years, research has shown evidence about past life has been preserved in impact glass here on Earth. A 2014 study led by scientist Peter Schultz of Brown University in Providence, Rhode Island, found organic molecules and plant matter entombed in glass formed by an impact that occurred millions of years ago in Argentina. Schultz suggested that similar processes might preserve signs of life on Mars, if they were present at the time of an impact."Glasses containing biological material exist elsewhere too, such as the bugs trapped in amber that gave us Jurassic Park and all the endlessly bad sequels. (Why don't the dinosaurs go after the movie directors and producers that hoist these stinkbombs on us? Call it "Jurassic Park goes Hollywood".) But the sap that forms amber is soft and gooey at "normal" conditions, not the red-hot heat of an impact crater, so given the apparent rarity of life on Mars in the first place, I would expect looking for signs of life in impact glasses to be the proverbial needle-in-a-haystack effort. Count me out.
But tying the discovery to "potential life on Mars" is a Standard Operating Procedure for NASA. Look at what other discoveries, interesting in themselves strictly from a scientific viewpoint, have been tied to "potential signs of Life":