The proper way to use a non-contact voltage detector is important. When doing a test, first verify it does detect power on a live circuit. Them immediately check the box/wiring you are testing, and if it fails to detect power then immediately verify it still does detect power on a live circuit.
Better detectors are sensitive enough that they will detect the static generated by rubbing it across a shirt. That's a quick way to see if the device is working.
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