The big boys who have high profiles friends will never get prosecuted. Same with Former NJ governor (do not remember the name) who used his FXBrokerage's funds but he was not charged...
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http://fortune.com/todd-newman-diamondback-insider-trading/
That meant Diamondback was an obvious candidate for the prosecutor’s scrutiny. The fund had been started a year earlier by two traders, Richard Schimel and Larry Sapanski, who had branched off from SAC Capital. What’s more, Schimel was married to Cohen’s sister. Although Diamondback hadn’t taken seed money from SAC, the connections between the two firms were obvious. (SAC would eventually, in 2013, agree to plead guilty to insider trading and to pay a massive $1.8 billion settlement, but
Cohen himself was not prosecuted.)