@Tasha @Ginger I only have a year of forensic science experience (was going to major in it and changed my mind, couldn't take the minutiae and the pressure) but from what I remember, DNA in sperm degrades rapidly. Like, if you freeze it to keep it longer the tails get all bent and they can tell it's been frozen.
Or I know that it dries out and dies within hours. So I imagine by the time someone takes a condom off, puts it in a bag and ships it across the country the sample is well and truly degraded. You could probably still make a DNA ID off of it (I'm sure you could, actually) but how would a criminal get that DNA out of the condom and into his victim?
Would he put the old dried out condom on his own dick? Then the original woman's vaginal fluid would be on the outside and the perp's skin cells would be on the inside. You can't mix dried body fluids w/water and expect them to reconstitute so that wouldn't really work either. Plus, in the unlikely event that this were to work all the sender would have to do is to produce sale receipts. That's what I imagine anyway, and I basically only know enough about forensic science to get myself in trouble and be a pain in the ass when everyone is watching Law and Order.

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