It was a rare show of bipartisanship - President Barack Obama, flanked by Democrats and Republicans in April, signing into law a bill that would ban insider trading on Capitol Hill. The measure, known as the STOCK Act, had passed the House and Senate in warp speed.

"The powerful shouldn't get to create one set of rules for themselves and another set of rules for everybody else," the president said at the time.

Lawmakers proclaimed that the bill, officially called the Stop Trading on Congressional Knowledge Act, would restore trust in government. It also applied new rules to some employees of the executive branch.

But CNN uncovered that the law that members of Congress thought they voted for earlier this year isn't exactly as advertised. A loophole could still allow family members of some lawmakers to profit from inside information.

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