What was found on Mars could be something not from Mars but from us contaminating or asteroids hitting Mars

OK so, a couple days ago report that Mars Rover at last got good sample of a rock and found something interesting, but now it appears to be many possibilities, I don’t know how long would it take them to confirm whether that rock did contain something, many mini martian drawing LOL, ok not funny. The fact is that we have sent many space probes to that planet and we could brought some kind of bacteria or organic from Earth to Mars and started to contaminated Mars, just like how the old days those explorer from Europe sailed to America and contaminated our soil and water with their plants and it made big impact, look at how many new plants brought over of Europe and other regions, and so now we’re repeating the same steps as how explorer spread and contaminated each other lands 🙂