, analyzing, and controlling instruments; photographic, medical and optical goods; watches and clocks - miscellaneous manufacturing industries - transportation & public utilities - railroad transportation - local and suburban transit and interurban highway passenger transportation - motor freight transportation...
of surveillance that look for terrorist or criminal activity, or as a means to verify the identity of individuals who wish to gain access to a secure place or system. in today's world, such capabilities appear necessary. these systems, however, have technical limitations and associated error rates....