Police Blotter Mens Firefighter Thin Red Line Vertical Flag T-Shirt. What began as a way for the Apex FD in North Carolina to poke fun at the police department went on to become a symbol of courage, honor and respect for fallen firefighters across the USA. Represent the Brotherhood and your country proudly with the Thin Red Line Vertical Flag T-Shirt. The Original. Many companies try to copy our designs but there is only 1 Police Blotter. The Police Blotter brand is printed in the USA by cops, ex-military members and first responders for cops, military, first responders and their supporters. WARNING: MAKE SURE IT SAYS POLICE BLOTTER IN THE BUY BOX OR YOU WILL NOT BE GETTING AN AUTHENTIC POLICE BLOTTER ITEM.