Why was Paula Broadwell's Driver's License found in a Washington, D.C. Park?

Paula Broadwell, the alleged mistress of former CIA Director David Petraeus, lives in Charlotte, NC. Yet, for some reason, her Driver's License was found in a Washington, D.C. park.

Via U.S. News:

The woman revealed to have been carrying on an affair with former CIA Director David Petraeus lost her driver's license in a Washington, D.C., park recently, sources tell U.S. News.

A Maryland National Capital Park Police spokesman confirmed that a jogger found a North Carolina license in Rock Creek Park belonging to Paula Broadwell. Park Police planned to hold it for 90 days, per policy, and then send it back to the North Carolina Department of Transportation.

The Park Police also alerted the FBI, says Bill Kellogg, a spokesman for the Park Police. The FBI did not initially return calls for comment on the report.

Broadwell's attorney, Robert F. Muse, confirmed that Broadwell, a North Carolina resident, lost her driver's license in the park.

Of course, if there is nothing to the fact that Broadwell was in Washington, D.C. recently, there should be no problem with telling us all why.

On the other hand, if there is a problem with telling us why, we won't be told.

And that's a problem.