Perseverance rover finds organic matter ‘treasure’ on Mars
https://edition.cnn.com/2022/09/15/world/perseverance-rover-mars-images-scn/index.html
Even if organic matter is found on Mars, it would be difficult to conclude whether or not there used to be living things on the red planet.
There is a possibility that it derives from splitted parts of rock that gave earth origin of living things.
