The nation's police chiefs are finding an alarming increase in criminals' use of assault weapons — the high-powered battlefield rifles that used to be banned, back when the federal government showed greater concern for public safety. The 10-year ban expired in 2004, despite the vows of presidential nominees from both parties to fight for renewal. Congress hasn't mustered the guts to try, preferring to roll over for the gun lobby. A survey of more than 130 local... (GunPolicy.org)