To Catch a Cheater: PI's Track Digital Footprints

From Facebook, to Twitter to text messages, online antics could mean the end of infidelity.
3:00 | 01/24/13

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Transcript for To Catch a Cheater: PI's Track Digital Footprints
Cheaters beware. Blood trail of clues that you may I realize you're leaving could be coming back to Honshu from tweets to -- -- FaceBook messages the digital age. Has blown open the door to new and cutting yet to ways to catch -- red handed. Including hidden electronic clues that may even even the delete button can't destroy. Here's ABC's -- walked. Technology. Its in Fidelity's best friend text. -- -- -- Some say 30% of dating site users are -- and a social networking sites like. -- get a bad -- -- marriage breakers allowing us to rapidly reconnect with that high school sweetheart or. Needs -- total stranger diminished our marriages should doldrums. But there's -- flip side and John and Azaria and hard nosed PI joined me and it. Seedy motel room and see no doubt -- many sordid liaison to explain. What's going -- privacy doesn't exist -- Privacy doesn't exist and over. Lipstick on a color is no longer -- biggest -- -- technology is going to get you caught at some point -- Knowledge is killing the cheater because an electronic infidelity trailers ninth near impossible to write. It was text messages that played a part in the -- -- of Tiger Woods from national heroes -- Serial philandering the picture was -- -- congressman Anthony Weiner. Laughing stock after conflicting sending photos of his command to young women -- which. And email. Opted for CIA director of our General David Petraeus he -- between the general and his biographer slash mistress. Provide it. Smoking gun and you know what. Federal. Fully human. Police are pre disposed to. Eat meat we're predispose. To fear -- and animals running towards us and we probably are pre disposed toward the delicate. Sure some married women cheat but according. Cheat more it's biological it's animal. Some people are more susceptible to this than others but this doesn't excuse them we are animals that can. -- no. To our heritage. It's a common problem so common that of course there's TV show about -- school teachers. Dealing with my -- home where people Oscar for help catching -- allegedly. -- timing partners. You know who was once a remedy for adultery infidelity in it was death I want are -- out of the house there is absolutely no legal penalties are remedy. For adultery now and so we have privately. Created a penalty. It's getting easier and easier to catch someone cheating -- -- -- that braille. Digital bread crumbs -- have you ever considered having -- oh absolutely yeah I mean I would love to. I had been planning one in fact this it's spring time Rob Delaney is a comedian and this column a -- piece of base male instinct Nielsen joined us. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Eleven master's degrees in three Ph.D. -- like a super genius and so if the two of them can't get it figured out then what what do you and I have. And I don't mean you and I having an affair now. These are just some noted that lead to texts that last Vegas PRI had offerman has recovered from cellphones of the alleged from the -- -- -- -- -- -- In general on the Internet people think that they're invisible. I think we can get away -- a lot. On his website -- offers for it. 69 bucks just -- dating sites we suspected -- Email address -- are the ones like -- into and they're not that's exactly that's they realize the kind of trailer to remove time. Thrown another funny 999 and he'll -- escort services and porn sites to -- Bit more from -- -- personal ads even creates a cyber -- track. And then there are always good old fashioned -- -- -- We look a phone bills for people cheating we look at the number of minutes someone is talking. Most -- most cell phone calls like a minute two minutes three minutes Max. When you see 304050. Minute cell phone calls. And that number keeps popping up. There's a problem. The -- says if you suspect your man is a teacher he will catch him because covering your tracks is -- Impossible is this the end of the fair. It's making a lot more difficult for the -- to be. Cheating used to be fun. I don't think -- much fun asked the general -- -- -- for Nightline. In Los Angeles.

This transcript has been automatically generated and may not be 100% accurate.

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