Whenever a baby is born, a small device is injected into him. This device works as a bomb, and is linked to your ID.
Now, say you're a wanted Felon, the government can just remotely activate the device, detonating your insides and killing you, but the explosion would be small enough where it wouldn't create a mess.
Does anyone see any flaws? I see none. Because if you live your life normally, it'd be exactly the same as it is now. It'd only be different if you committed major crimes.
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Oh, like the [i]Mark[/i] which the governments are actually planning on using. How -blam!-ing awesome, OP! Let's all just put something into us that'll allow the gov. to shut us down. Totally a great plan... Right? Bullshit.