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The circuit is grounded within the recepticle box. There is no need to ground the actual switch. == ==

This is normally seen in older switch boxes with older devices. new devices are required to have a separate ground just for the device. Grounding a device through a receptacle box no longer meets code. The new code state that both the box and device must be separately grounded. I would recommend replacing the switch with a new one that has a grounding screw. The reasoning for this is twofold. First, grounding through a box to a device is notoriously unreliable and secondly when the device is pulled out of the box by a service person the device loses its ground thus causing a safety issue.

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Q: Why do 2-way light switches have no ground terminal?
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