The department recently borrowed one plate reader from Daly City to monitor a funeral, Chief Jonsen told the council on June 4, and has also asked San Mateo County to loan its five units out as needed.
The mobile automated license plate readers, used by East Palo Alto as well as the county and other local jurisdictions, run hundreds of plates a minute within a 360-degree arc.
Chief Jonsen said that captured data is retained within a database in San Francisco, which also stores information from other jurisdictions. Councilwoman Keith said that the sheriff told her the county's policy is to keep the data for a year, then purge it. The chief said that a one-year retention policy is considered best practice.
The American Civil Liberties Union has been monitoring data collection by law enforcement; it recommends keeping the information for as short a period as possible and limiting access. Tiburon, for example, stores the data from automated license plate readers for only 30 days unless it relates to a specific criminal investigation.
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