I should have been more specific and said the voltage was capacitive coupled between the conductors and switch contacts rather than induced.
At any rate, your first choice when testing electrical circuits should be a Wiggy or other similar tester designed for the purpose. No real reason to use anything else like a VOM unless you need to do in depth troubleshooting. Then you need to keep in mind the high input impedance and the errors it may cause.
-Hal
