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"It is standard to run a split of your sample through first and dump it out, to clean out any residue from a previous sample," said Joel Hurowitz, a sampling system scientist on the Curiosity team. "We want to be sure the first sample we analyse is unambiguously Martian, so we take these steps to remove any residual material from Earth that might be on the walls of our sample handling system."
Thus releasing Terran microbes and commencing phase one of Martian terraformation. I knew it.