A Scanner Darkly is a 2006 American adult animated psychological science fiction film written and directed by Richard Linklater. It is based on the 1977 novel of the same name by Philip K. Dick. Synopsis: An undercover agent becomes addicted to a mind altering drug while on a mission to infiltrate the drug's supply chain.

References:
https://en.wikipedia.org/wiki/A_Scanner_Darkly_(film)