MADISON, Wis. -- University of Wisconsin-Madison's police chief has banned officers from using “Thin Blue Line” imagery while on duty. The move by Chief Kristen Roman follows criticism on social media of a “Thin Blue Line” flag displayed at the police department's office. The flag, which resembles a U.S. flag but has a blue stripe, is considered a sign of police solidarity, but has also been criticized as a symbol of white supremacy. Roman said the flag has been “co-opted” by extremists with “hateful ideologies” and that her department needs to distance itself from the imagery to build trust with...