http://www.espn.com/mlb/story/_/id/22513238/miami-marlins-honor-shooting-victims-wearing-stoneman-douglas-baseball-capsThe Miami Marlins will honor victims of the shooting at Marjory Stoneman Douglas High School by wearing the school's caps before their Grapefruit League opener Friday.
The Marlins will wear the caps during their workout and pregame before they face the St. Louis Cardinals in Jupiter, Florida. Miami is unlikely to be able to wear them for the game, due to Major League Baseball rules.
I can see if this were a regular-season game that some sort of protocol would be breached; but what would be the harm in letting the Marlins wear the caps for an exhibition game?