About 10 million Americans every year are victims of identity theft, and Sonoma County and the Bay Area see more than their fair share of these cases. In this first of a two-part series, KRCB's Danielle Venton speaks with identity theft victims and law enforcement to learn how to fight and prevent this crime.

Inspector Anne Madrid, of the Hayward Police Department and the Identity Theft Council shares what to do if you receive a suspicious call from a debt collector.

If you receive a suspicious call from an existing line of credit, make sure the call is legitimate, advises Madrid. Here's how: