[BOBWADE]

Sounds like the device used in the movie "deadlock" with Rutger Hauer. An eighties film that featured a new style of prison without walls and limited guards. The security was provided by the inmates in prison. If either prisoner left a marked perimeter or tampered with their collar, both collars would explode killing the prisoners. This kept the prisoners watching after their assigned partners. Interesting concept.

[BOBWADE]

here is the review on "deadlock", interesting read.
http://www.movieactors.com/ScienceFiction/f7.htm

[stlnative]

CSI also had a show on in July that had a necklace bomb in it.

[sonsofliberty2000]

Or even the movie Running Man. The prisoners had collars around their necks and if they ran past a certain mark the bomp exploded decapitating them.

New on Patriot Paradox: Interview with MHGinTN and Coming Soon: The Chewed Gum Interview

[Smogger]

Sounds like the device used in the movie "deadlock" with Rutger Hauer. An eighties film that featured a new style of prison without walls and limited guards. The security was provided by the inmates in prison. If either prisoner left a marked perimeter or tampered with their collar, both collars would explode killing the prisoners. This kept the prisoners watching after their assigned partners. Interesting concept.

That's exactly what I thought of when I first read this story. I wonder if it looked anything like this:

In two other popular Rutger Hauer films the actor played a blind swordsman man who wielded his weapon which was disguised as a walking stick against the forces of evil.