in about 20 of the police reports that can be found all over the web
Just read 10 of the articles and there is no indication ballistics tests were run. They conclude because there was a shoot out that same day across the border, that because the bullets seemed to be coming in a downward trajectory they might have come from that...That the bullets "matched" the ones used implied they were run through true ballistics tests, and were fired from the exact same gun.