FILE: People wave thin blue line flags while they attend a Back the Blue rally in support of police departments in Quincy, MA. (Photo by Jonathan Wiggs/The Boston Globe via Getty Images) CHARDON, Ohio - An Ohio school district is banning “thin blue line” flags after a high school football player carried one onto the field to honor local first responders, including a coach who is also a police officer.“This display will not be a part of future pre-game activities at Chardon athletic contests,” Chardon Local Schools Superintendent Michael P.