Minette
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They can retrieve far more info than you'd think. Salt or warm water is the least favorable, but fingerprints and even blood DNA can be retrieved. Even after 4 days. (Even after months.)
I wondered the same thing and found a site that has some info that seems to suggest that fingerprints can indeed be recovered from submerged items for at least several days! (And that the item should be kept wet until testing can be done, which is consistent with the reports that the gun was being transported to the lab still covered in salt water.)
Fingers crossed for incontrovertible proof!
http://www.ucidiver.com/fingerprints.html