[Cheburashka]

Or at least in their clothing or dog tags or weapons. Somewhere there could be a homing device, set to a specific frequency.
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The first thing you do when you capture a prisoner is take his weapon.
And if I were working on the other side I would strip a prisoner of all his clothes as a matter of security right now. If I don't have any new clothes to give him at that time that's his problem.

[colorcountry]

I would strip a prisoner of all his clothes as a matter of security right now.

Doesn't matter... you can track his weapons and personal effects....anybody caught with them after the fact would be in essence caught red-handed. Come on, they do this at department stores. If you're going to be caught with merchandise that sets of an alarm it acts as an effective deterrant to theft. I am not saying it will deter all POW's, I'm just saying the treat of discovery might make some of these buggers think twice. You could definitely hone in on the evidence now couldn't you.

I am also aware that the reason behind some here on FR not wanting chips implanted in the bodies of soldiers is because of the whole 666 thing. This is an alternative suggestion, that's all.