In Richardson, Texas, the city ordinance requires all door-to-door salesmen to
(1) get a peddler's license (http://www.cor.net/pd/solicitation/homepage.html) ,
(2) get permission from the building owner before soliciting.
I had to call 911 to get these salesmen out of my shop. They had neither permit nor permission, and they would not leave my business.
These 3 salesmen have plagued my shop 3 times now, and next time they're gonna get a baseball bat. The business property is posted "No Soliciting - $500 Fine" it seems they hire only people who won't read warning signs.
I filed a complaint against this company with the local police, and they'll be on the watch for these obnoxious SOB's the next time they're in the neighborhood.