A surveillance company's plan to track cars nationwide is raising alarm, and it's bad news for anyone who values privacy.

• Flock, a license-plate camera company, drew up a plan to turn 350,000 Uber, Lyft, and delivery cars into roving plate scanners through a partnership with dash-cam maker Nexar.
• Flock says the deal was never carried out, but the drivers — and likely their passengers — may never have known their cars were being used to collect data.
• The system is already misfiring: police have held people at gunpoint over outdated alerts, and detectives have accused innocent people of crimes based on bad camera matches.
• At least 50 officers have been caught misusing Flock data to stalk people, including a police chief who allegedly tracked an ex-girlfriend hundreds of times.
• Flock is expanding fast, buying a police-drone company and cutting deals with Ring doorbell cameras, feeding fears of a wider tracking network.

Outlook: Expect surveillance cameras to become a real campaign issue, with Florida candidates already saying voters want limits on Flock.