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"At its best, SF is the medium in which our miserable certainty that tomorrow will be different from today in ways we can't predict, can be transmuted to a sense of excitement and anticipation, occasionally evolving into awe."
- John Brunner

Halo  
  Device that incapacitates a person by inducing unconsciousness.  

In the film, the halo (which is also referred to euphemistically as a 'hat') induces unconsciousness both in the short term (when a 'precriminal' is caught) as well as in the long term - incarceration.

 

"And now Fletcher steps forward with what is essentially a metal HALO. Fletcher places it on Howard's head while he screams...
As the halo is fitted onto his head, Howard's body arches in a convulsive shock, his eyes rolling white into his head as he finally goes limp."

Technovelgy from Minority Report (Movie), by Steven Spielberg.
Published by Dreamworks in 2002
Additional resources -

Although not used in a similar manner (i.e., by law enforcement), you might compare this device to the napcap from Larry Niven's 2000 novel Saturn's Race, the sleep set from Niven's 1970 novel Ringworld as well as the sleep-inducing helmet from Arthur C. Clarke's 1964 story Sunjammer.

Thanks to an anonymous reader for contributing this item.

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Additional resources:
  More Ideas and Technology from Minority Report (Movie)
  More Ideas and Technology by Steven Spielberg
  Tech news articles related to Minority Report (Movie)
  Tech news articles related to works by Steven Spielberg

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