Some tour guides challenge constitutionality of District's licensing test

Some tour guides challenge constitutionality of District's licensing test:

Whenever Tonia Edwards leads a Segway tour to the Capitol, the route takes her past the Newseum, where she points out the First Amendment etched on the building's facade.

Edwards doesn't mention just how well she knows the amendment's 45 words. Instead, she continues to the E. Barrett Prettyman Federal Courthouse, which has become a place of particular interest for local tour guides - especially Edwards and her husband, Bill Main, who own and operate Segs in the City.

Last week, the couple joined the Institute for Justice, a nonprofit libertarian law firm, in filing a federal lawsuit challenging the constitutionality of the District's tour-guide regulations, which make it illegal to lead a paid tour in Washington without a license."