Dozens of police departments nationwide are gearing up to use a tech company's already controversial iris- and facial-scanning device that slides over an iPhone and helps identify a person or track criminal suspects. Its use has set off alarms with some who are concerned about possible civil liberties and privacy issues. The smartphone-based scanner, named Mobile Offender Recognition and Information System, or MORIS, is made by BI2 Technologies in Plymouth, Massachusetts. An iris scan, which detects unique patterns in a person's eyes, can reduce to seconds the time it takes to identify a suspect in custody. When attached to an iPhone, MORIS can photograph a person's face and run the image through software that hunts for a match in a BI2-managed database of U.S. criminal records. Constitutional rights advocates are concerned, in part because the device can accurately scan an individual's face from up to four feet away, potentially without a person's being aware of it. Experts also say that before police administer an iris scan, they should have probable cause a crime has been committed. What we don't want is for them to become a general surveillance tool, where the police start using them routinely on the general public, collecting biometric information on innocent people," said Jay Stanley, senior policy analyst with the national ACLU in Washington, D.C.