So that people know what the hell Adam is talking about, i'll tell you some vital information. Its a film of the Philip K Dick novel directed by Richard Linklater (Before Sunrise/ Dazed & Confused).
Plot summary:
"A Scanner Darkly" is set in suburban Orange County, California in the future. It imagines a paranoid world in which it seems two of every 10 Americans has been hired by the government to spy on the other 8 -- in the name of national security and drug enforcement. When one reluctant government recruit (Reeves) is ordered to start spying on his friends, he is launched on a journey into the absurd, where outsourced government contractors largely define the social construct, where identities and loyalties are impossible to decode, and where not even his girlfriend can be trusted. The film highlights the inconsistencies and ironic consequences of the war on drugs.
In the future, there is a new drug called "Substance D", or simply, "Death". Bob Arctor is a dealer of this new drug, and he himself is also addicted to it. Fred is an undercover cop who wears a "scramble Suit" (which constantly re-animates the user's appearance and voice) all the time so people don't know his true identity. Fred, one day, is assigned to spy on Bob using "Scanners", and eventually destroy Bob's drug ring. However, one side effect of Substance D is the formation of multiple personalities, and because of the occurring circumstances, Bob and Fred don't realize that they are actually the same person, and that Fred is basically hunting-down himself.
Trailer at
Apple.