My ID is rather small, and I believe it to be harmless. I would assume the Neutral's are of the same fashion. Made of some fancy plastic material, holo-processor for the image and information display, and not much else.
And just to comment on the door busting attacks from Omni-Tek. If Omni-Pol is breaking down your door, you're probably a criminal. I've spent my entire life working for Omni-Tek, just like my Parents and we've never spoken to someone who has had their door broke down by the police and members of their family beaten or arrested. I attribute my lack of speaking to people like that because I limit my dealings with criminals.
If you live a law-abiding life then you will be well with Omni-Tek and the Corporation will protect you. Simple concepts that are upheld on most planets regardless of who owns it.