Doug Bates and his wife, Stacey, were in bed around 10 p.m., their 2-year-old daughters asleep in a nearby room. Suddenly they were shaken awake by the wail of police sirens and the rumble of a helicopter above their suburban Southern California home. A criminal must be on the loose, they thought. Doug Bates got up to lock the doors and grabbed a knife. A beam from a flashlight hit him. He peeked into the backyard. A swarm of police, assault rifles drawn, ordered him out of the house. Bates emerged, frightened and with the knife in his hand, as his wife frantically dialed 911.