if they have physical access, they can just steal the machine... I would suggest that it's not an issue in itself, and that they should simply not have physical access in the first place. You can put on a grub password and change the grub entries if you mean that there is an explicity entry for rescue, but what if they just put a cd in and reboot? bios password can also deal with that, but if they can still just pick up the box and walk out, or remove the drives...
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