Cop behind Kaepernick salutes during protest

Colin Kaepernick's protest against police brutality and racial inequality remains as polarizing as ever.

Kaepernick, making his first start of the season Sunday against the Buffalo Bills, knelt during the national anthem, as he's been doing since August. Not everyone was on board, with a police officer directly behind the San Francisco 49ers quarterback saluting.

Kaepernick was also booed prior to the game.