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The Man Who Brought Down Bernie Madoff

08/22/2011 06:30 pm ET | Updated Oct 22, 2011

Today, I spoke with Wall Street whistleblower Harry Markopolos, whose dogged investigation led to the downfall of Bernie Madoff. His best-selling book, No One Would Listen, is now the basis for the new documentary Chasing Madoff.

I closed our conversation by asking if anything like this could happen again.

The full interview airs tonight on PBS.