According to this Scientific American blog, ...we know that nature has been busy cross-contaminating worlds for the past 4 billion years. And hardy little critters like tardigrades have likely already been deposited far beyond the Earth. ... (and) it is conceivable that any life in our solar system has spent the past few billion years in a merry game of natural cross-contamination; mixing it up on a regular basis.
Why aren't we looking for lawki or its detritus? Why doesn't this assumption inform more of our missions to other bodies? Instead it seems the "holy grail" of a separate genesis event is of more concern, why?