*shrugs* I play with the world as described, for the most part, with pretty much only simple logical extrapolations. You CAN send a DNA query to the SIN registry; you could even send a DNA query to corporate databases, and here's the kicker: if that corporation is looking for your DNA target, and they have the information, they're going to let you get it - because they're going to trace you by that query, show up on your doorstep, and ask you to point out DNA Target Guy. If you're connected, you might be able to do it on the down-low, but again, Medicineman (and others), you seem to be playing strictly by only what gear has been given, and not extrapolating it at all.
*shrugs again* Play it how you want. If it doesn't make sense, change it. For me, it makes sense, though, and if you're arguing against my explanations, I get the sense that you don't want to make sense of the way it is, and you'd rather have it the way you want it. If so, why not just have it the way you want it, and forego the frustration of this kind of debate??