Earlier this season, I had an 8th grade boys game that I started solo because my partner was delayed due to being held up at work.
During the visiting team's first substitution, I noticed a player had rubber bracelet on. I directed him to leave the floor and informed the coach as to why. I had noticed the player was wearing a royal blue undershirt under a navy blue jersey. I figured blue is blue and didn't mention it.
The player removed the bracelet and a few minutes later, went to come in again. It just so happens, my partner had just arrived and went to beckon in the substitutes. He noticed the same subtitute's royal blue undershirt and sent him off. I thought the V HC was going to blow a gasket. Good times.