Whistleblowers are no more likely to go to the government than internal compliance officers with concerns even when a windfall cash payment is dangled over their heads, a reportfrom an advocacy group said.

Studying cases filed under the False Claims Act since Jan. 1, 2007, the National Whistleblowers Center found that 89.7% of employees who filed a qui tamsuit reported their findings internally beforehand. This finding contradicts warnings from business groups and law firmsthat say a provision in the Dodd-Frank financial...