"The craft, Spirit and Opportunity, landed on Mars last year. One key task was to look for signs of life -- now it seems that if there are any organisms, it is man who has put them there. If proved, the contamination would raise concerns at possible breaches of a United Nations treaty to stop other planets being polluted from Earth."
Has it occurred to anyone that Mars and Earth exchange literally tons of each other's mass every year? So the overwhelming odds are that terrestrial microbes are already a part of the Martian biosphere -- and vice versa. If Earth life is shuttling to Mars, it certainly doesn't need our robots to do it.
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