OK folks, this is an official communication from the Flint, Michigan police department (via Lindsay Beyerstein):

Police Chief David Dicks is on the lookout…On June 27, the chief issued a departmental memorandum telling officers: “This immoral self expression goes beyond freedom of expression.”

Dicks, 41, broke down his interpretation of the laws as such: Pants pulled completely below the buttocks with underwear showing is disorderly conduct; saggy pants with skin of the buttocks showing is indecent exposure, and saggy pants, not completely below the buttocks, with underwear exposed results in a warning.