"There was a law called the Federal Assault Weapons Ban [signed in 1994], but the law was written with an expiry date and Congress let it expire in 2004. That law banned possession of certain types of assault weapons, including the weapon James Holmes used in Aurora last week. The law banned possession of large-capacity bullet clips, so people could only purchase guns that could hold 10 bullets. But since the law expired in 2004, Holmes was able to use a weapon that held 100 bullets at a time. It’s like something out of a science fiction novel, frankly."