Hawaii's growing network of automatic license plate readers is drawing a privacy backlash, good news for civil liberties advocates and a headache for police agencies that want the cameras.

• More license plate cameras are going up across Hawaii, scanning and logging vehicles as they pass.
• County officials are pushing for rules on how long the data is kept and who can see it.
• Police back the technology as a tool for finding stolen cars and tracking suspects.
• Critics say constant scanning tracks the movements of ordinary drivers who have done nothing wrong.

Outlook: Expect county-level rules on data retention and access to be the main fight as the camera network keeps expanding.