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Most homes here have per-circuit devices (or even just per-outlet) that are required by code in certain rooms (eg. bathroom) and on outside (the building) circuits.

Actually, a GFCI outlet will also protect any "downstream" outlet, too. Can be a pain when something trips and you have to wander all over the house trying to find which GFCI needs resetting. Less of a pain than getting electrocuted, though.
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Bitt Faulk