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Hire a real person. Any p2p network can give you a copy of one of those $30 programs that claim to make you an internet investigator. All they do is give you publically avialable, free information in a crappy interface that I could have made in Visual Basic in ten minutes.
I don't know what the real people who advertise online are like, but I'll bet that you can do a decent amount of research with public records
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