Police use of facial recognition technology usually only makes the headlines when it's connected to a high-profile crime. But it's increasingly being deployed in more mundane circumstances: There have been reports of police departments employing facial recognition to spot criminals from gas station security footage, identify suspects who aren't carrying photo ID, and assist in social media surveillance. Lawmakers are starting to scrutinize the technology as well. Municipal legislators in San Francisco unveiled an ordinance proposal on Tuesday that, if passed, would make the city the first in the country to completely ban government use of facial recognition systems. The bill would also establish an audit system for agencies acquiring any surveillance technologies.