License plate scanners:?A rapidly growing network of police cameras is capturing, storing and sharing data on?license?plates, making it possible to stitch together people's movements whether they are stuck in a commute, making tracks to the beach or up to no good.
Officer Dennis Vafier, of the Alexandria Police Department, uses a laptop in his squad car to scan vehicle license plates during his patrols, Tuesday, in Alexandria, Va. Local police departments across the country have amassed millions of digital records on the location and movements of vehicles with a license plate using automated scanners. Affixed to police cars, bridges or buildings, the scanners capture images of passing or parked vehicles and note their location, dumping that information into police databases
Pablo Martinez Monsivais/AP
EnlargeLaw enforcement agencies across the U.S. have amassed millions of digital records on the location and movement of every vehicle with a?license?plate, according to a study by a prominent civil rights organization.
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A rapidly growing network of police cameras is capturing, storing and sharing data on?license?plates, making it possible to stitch together people's movements whether they are stuck in a commute, making tracks to the beach or up to no good.
For the first time, the number of?license?tag captures has reached the millions, according to the study published Wednesday by the American Civil Liberties Union based on information from hundreds of law enforcement agencies. Departments keep the records for weeks or years, sometimes indefinitely, saying they can be crucial in tracking suspicious cars, aiding drug busts, finding abducted children and more.
Attached to police cars, bridges or buildings ? and sometimes merely as an app on a police officer's smartphone ? automated?scanners?capture images of passing or parked vehicles and pinpoint their locations, uploading that information into police databases.
Over time, it's unlikely many vehicles in a covered area escape notice. And with some of the information going into regional databases encompassing multiple jurisdictions, it's becoming easier to build a record of where someone has been and when, over a large area.
While the Supreme Court ruled in 2012 that a judge's approval is needed to use GPS to track a car, networks of?plate?scanners?allow police effectively to track a driver's location, sometimes several times every day, with few legal restrictions. The ACLU says the?scanners?are assembling a "single, high-resolution image of our lives."
"There's just a fundamental question of whether we're going to live in a society where these dragnet surveillance systems become routine," said Catherine Crump, a staff attorney with the organization. The group is proposing that police departments immediately delete any records of cars not linked to any crime.
Although less thorough than GPS tracking,?plate?readers can produce some of the same information, the group says, revealing whether someone is frequenting a bar, joining a protest, getting medical or mental help, being unfaithful to a spouse and much more.
In Minneapolis, for example, eight mobile and two fixed cameras captured data on 4.9 million?license?platesfrom January to August 2012, the Star Tribune reported. Among those whose movements were recorded: Mayor R.T. Rybak, whose city-owned cars were tracked at 41 locations in a year.
A Star Tribune reporter's vehicle was tracked seven times in a year, placing him at a friend's house three times late at night, other times going to and from work ? forming a picture of the dates, times and coordinates of his daily routine. Until the city temporarily classified such data late last year, anyone could ask police for a list of when and where a car had been spotted.
As the technology becomes cheaper and more widespread, even small police agencies are able to deploy more sophisticated surveillance systems. The federal government has been a willing partner, offering grants to help equip departments, in part as a tool against terrorism.
Law enforcement officials say the?scanners?are strikingly efficient. The state of Maryland told the ACLU that troopers could "maintain a normal patrol stance" while capturing up to 7,000?license?plate?images in a single eight-hour shift.
"At a time of fiscal and budget constraints, we need better assistance for law enforcement," said Harvey Eisenberg, assistant U.S. attorney in Maryland.
Law enforcement officials say the technology automates a practice that's been around for years. The ACLU found that only five states have laws governing?license?plate?readers. New Hampshire, for example, bans the technology except in narrow circumstances, while Maine and Arkansas limit how long?plate?information can be stored.
In Yonkers, just north of New York City's Bronx, police said retaining the information indefinitely helps detectives solve future crimes. In a statement, the department said it uses?license?plate?readers as a "reactive investigative tool" that is only accessed if detectives are looking for a particular vehicle in connection with a crime.
"These?plate?readers are not intended nor used to follow the movements of members of the public," the department said.
Even so, the records add up quickly. In Jersey City, New Jersey, for example, the population is 250,000, but the city collected more than 2 million?plate?images in a year. Because the city keeps records for five years, the ACLU estimates that it has some 10 million on file, making it possible for police to plot the movements of most residents, depending upon the number and location of the?scanners.
The ACLU study, based on 26,000 pages of responses from 293 police departments and state agencies across the country, found that?license?plate?scanners?produced a small fraction of "hits," or alerts to police that a suspicious vehicle had been found.
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