< Chances gotta be REAL small (distance, cross section, radiation, ice) but it is possible that DNA life may have even polluted postulated Europan oceans. Assuming we find life somewhere else in this solar system and it's not DNA template life that coulda been carried there eons ago, biological sciences will get a major boost.

Well, Jupiter is ~70% of the orbital mass of the solar system which I would say gives it a hell of a cross section for trapping all kinds of crap in orbit about it.
This definately gives Europa decent (what ever that means in this case) chances of aquiring biological material.

That's assuming there are meteorites from Earth and Mars that could get enough deltaV to get that far out without becoming sterilized.