In the 2002 movie, Minority Report, Tom Cruise plays an officer who is accused of a murder he has yet to commit. Although the science behind this futuristic policing is sketchy at best, other novel concepts in the film are not far off.
For instance, upon walking into The Gap, Mr. Anderson (played by Cruise) is greeted with a holographic image asking him how those assorted tank tops worked out for him. While we don’t currently experience personal advertising based on identification by retina scan, we are offered targeted ads based on our past behavior.
This is called retargeting, and the way it’s been used has evolved in recent years.