Get a pair of her splooged, skid marked panties, there's a place that will do DNA scrapes and find the offending guys baby butter and compare to hubbies for around 100 bucks. If they've been separated, she shouldn't be carrying any man milk so she's busted either way.

This was on Howard stern show ( the company that provides this service)
Women can't help leaving a trail of evidence in an around the gash so it's easy to bust'em the filthy whores!!