Tonight at 10P/9C Chris Hansen will reveal the complex world of online classified ads in an exclusive Dateline report. We chatted with Chris about what we can expect to see in the show tonight, including his meeting with someone who suggests he is a hit man, a student selling a kidney in order to pay for college, and a drug dealer who claims to be selling a list of his clients. Hear more about the fascinating investigation and what shocked him the most about this story:

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