For starters it becomes harder to find martian life. The earth life could kill the martian life before we get a chance to find it. Also, if the experiments dete

For starters it becomes harder to find martian life. The earth life could kill the martian life before we get a chance to find it. Also, if the experiments detect signs of life, we won't be able to know if it's from martian life or from the earth life we brought along.