A Scanner Darkly

In a totalitarian society in a near future, the undercover detective Bob Arctor is working with a small time group of drug users trying to reach the big distributors of a brain-damaging drug called Substance D. His assignment is promoted by the recovery center New Path Corporation, and when Bob begins to lose his own identity and have schizophrenic behavior, he is submitted to tests to check his mental conditions.

A Scanner Darkly is a 2006 film directed by Richard Linklater based on the novel of the same name by Philip K. Dick. The film tells the story of identity and deception in a near-future dystopia constantly monitored by intensive high-technology police surveillance in the midst of a drug addiction epidemic. To give the film its distinct look, the movie was filmed digitally and then animated using interpolated rotoscope over the original footage.

Source: Wikipedia