Once your gun is taken by law enforcement, you can assume it is gone, and will be very lucky to get it back, and if you do, it might take a year or two. I speak from experience. And I speak of legally owned guns, not criminals, since they already know that they aren't getting thier gun back, How much money is your life worth?
A long story could be told here, but I'll just give out the cliff's notes.
About 8 years ago I bought a Norinco SKS. Fully loaded, synthetic stock, 30rd mag, bipod, red dot scope, you know, everything that makes it an evil black gun.
I kept it in my truck most of the time, because I like to shoot it a lot. One night, it was taken out of my truck by a former friend of mine. Evidently he had gotten into a fight with several guys and got his butt kicked.
Long story short, he dumped the mag at a gas station where a lot of the guys were. He didn't hit any of them(he later said he was aiming high). My gun got taken away because of that and it took almost 3 years to get it back.
My brother had 2 of his guns taken away last year. A longer story goes into that, and he should have had a better lawyer. The DA let me take possession of the guns when the hearing was over and I just ended up buying them from my brother.
In 1981, someone broke into our fab shop here at the house. I was still in the belly of my mom who was laid up in bed. My dad heard the noise and went outside with his .357(Security Six, I believe). The BG in the shop came at my dad with an axe and dad shot him 3 times. The gun was taken away and the BG's family tried to sue us for wrongful death. Dad got a good lawyer and beat it. He got the .357 back about 5 months after the incident, but had bought one identical to it while the original was in impound. He sold the original and gave me the new one for my 20th birthday.
I don't know how it is every where else, but at least where I'm at common sense usually prevails and once it's established that you're the good guy.
-John