Last October, Charles McKinney, then a senior vice president at UBS Financial Services, played a prominent role in the insider trading trial of his client, Dallas Mavericks owner Mark Cuban. McKinney found himself in front of a Dallas federal court jury in part thanks to a 2004 email message that Cuban, the entrepreneur and "Shark Tank" star, sent McKinney about a massive trade he made that same year.

"I wanted to make sure I was 100 pct kosher on that trade," Cuban wrote in the e-mail to McKinney. He asked McKinney to check with his compliance and legal department to confirm the legality of the trade, which McKinney did. His firm's team raised no red flags over the trade.

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