Well, the Brady Bunch is at it again. With the release of of the ATF Firearms Trace Data for 2009, we have the proverbial knickers in a knot response from the Brady Campaign.
I haven't had time to sit down and run any data, but from the states I looked up (NY, CA, MA, SD, and WY) the bulk of the 'crime guns' numbers came from inside the state itself. NY had over 1800 trace requests, CA had over 11,000, and MA had over (of course with the most draconian laws in the country, is it any wonder?). SD and WY each were under 200 (167 and 192 respectively) total trace requests. Makes you wonder, don't it?