Specific case law for chalking. In this instance, in front of the White House.
PATRICK MAHONEY, REVEREND, ET AL.,
APPELLANTS
v.
JOHN DOE, IN HIS OFFICIAL CAPACITY AS A POLICE OFFICER,
METROPOLITAN POLICE DEPARTMENT, ET AL.,
APPELLEES
Appeal from the United States District Court
for the District of Columbia
(No. 1:09-cv-00105)