We know that twice, guards had to remove him by force from his cell.

NPR: Moussaoui Courts Death, and the Media, at Trial

Virtually every police cell in the West Midlands force failed safety tests, inspectors have said.

BBC: Inspectors condemn West Midlands force's cells

So not only does the collar have to withstand enormous force but it needs to contain a GPS device, a cell component for data transmission, and battery power for a full year.

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Gloucestershire Police Authority put forward the plans to build a 50-cell suite after the need was identified by the police force.

BBC: Labour PCC candidate for Gloucestershire Rupi Dhanda

Technologies that let an IP-based telecommunications provider offer IP telephony services commensurate in quality to the traditional switched circuit providers, or at least as good a quality as cell phone providers can offer, are now getting close to being finalized by the Internet Engineering Task Force.

CNN: IP telephony is the "in" thing these days, but should it be?