Mars Photo Album - Opportunity Knocks

If the newest NASA space mission finds evidence of life on Mars, how can we be absolutely sure the evidence didn't hitch a ride from earth on the spacecraft itself?

Michael,

Two words for you:
Cassie Conley
She's NASA's Planetary Protection Officer (possibly the coolest job title ever) and leads their efforts to prevent exactly what you're suggesting.
More info here: http://quest.nasa.gov/people/bios/astrobiology/conley.html

Thanks
Peter Dykstra

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