ST. LOUIS (AP) – The American Civil Liberties Union is seeking an end to the so-called “five-second rule” for Ferguson protesters.

The shooting death of Michael Brown by a Ferguson police officer on Aug. 9 led to volatile nights of looting and protests in the St. Louis County town. On Aug. 18, police began enforcing a rule to keep protesters moving along West Florissant Avenue, or face arrest.

The ACLU sued and the case went to court on Monday. Some testified they were told to keep moving for no apparent reason, sometimes during times when protests were peaceful.