License plate readers in the U.S. and how it affects our privacy.
Police can also plug any license plate number into the database and, as long as it passed a camera, determine where that vehicle has been and when. Detectives also can enter a be-on-the-lookout into the database, and the moment that license plate passes a detector, they get an alert.
It’s that precision and the growing ubiquity of the technology that has libertarians worried.
Even though they are relatively new, the tag readers, which cost about $20,000 each, are now as widely used as other high-tech tools police employ to prevent and solve crimes, including surveillance cameras, gunshot recognition sensors and mobile fingerprint scanners.
License plate readers can capture numbers across four lanes of traffic on cars zooming up to 150 mph.
With virtually no public debate, police agencies have begun storing the information from the cameras, building databases that document the travels of millions of vehicles.
Nowhere is that more prevalent than in the District, which has more than one plate-reader per square mile, the highest concentration in the nation. Police in the Washington suburbs have dozens of them as well, and local agencies plan to add many more in coming months, creating a comprehensive dragnet that will include all the approaches into the District.
“It never stops,” said Capt. Kevin Reardon, who runs Arlington County’s plate reader program. “It just gobbles up tag information. One of the big questions is, what do we do with the information?”
Police departments are grappling with how long to store the information and how to balance privacy concerns against the value the data provide to investigators. The data are kept for three years in the District, two years in Alexandria, a year in Prince George’s County and a Maryland state database, and about a month in many other suburban areas.
“That’s quite a large database of innocent people’s comings and goings,” said Jay Stanley, senior policy analyst for the American Civil Liberties Union’s technology and liberty program. “The government has no business collecting that kind of information on people without a warrant.”
Should someone access the database for something other than a criminal investigation, they could track people doing legal but private things. Having a comprehensive database could mean government access to information about who attended a political event, visited a medical clinic, or went to Alcoholics Anonymous or Planned Parenthood.
http://www.washingtonpost.com/local/license-plate-readers-a-useful-tool-for-police-comes-with-privacy-concerns/2011/11/18/gIQAuEApcN_story.html