I'm not familiar with Va. law. In Ohio, PI's must be licensed and registered. In Pa., they do not have to be licensed (at least, not back in 2000 when I was living in Pittsburgh). Personally, I'd get a concealed carry license aswell. Cheating spouses might not be criminal activity, but the ire invoked if one of the cheaters catches you is enough for some people to turn very violent.

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I'm like one of those idiot savants...well, except for the savant part.