Last month, a government auditor noted steps the U.S. Attorney’s Office for the District of Columbia has taken to improve its efforts to take down lobbyist scofflaws. Officials contracted a paralegal to work on such cases, for example, and they set up a database to better manage records on infractions.

The office has sent hundreds of letters and e-mails and made calls to lobbyists who may have violated the law. And often, lobbyists are heeding prosecutors’ requests. In 2010, for example, the office notes that half the lobbyists contacted have complied with their communications.