Roughly twenty special prosecutors (called independent counsels after 1983) were appointed under the Ethics in Government Act and its reauthorizations during the Jimmy Carter, Ronald Reagan, George H. W. Bush, and Bill Clinton administrations. These include significant investigations into the Iran–Contra affair and the Whitewater controversy, the latter of which ultimately led to the impeachment of Bill Clinton over the Lewinsky scandal. Numerous smaller investigations into cabinet secretaries for relatively minor offenses, such as drug use, were also carried out by independent counsels during this period.