"Sharpton calls for full investigation into Border Patrol for using reins to direct horses."

While it's possible to direct a horse without the use of reins, you sure wouldn't want to go into a situation like the Border Patrol faced without reins available because riding horses requires the ability to use all one's tools. I also heard him say something about 'weaponization of horses', which is a total fraud. Those horses were neither trained nor functioning as battle steeds, and if one wonders what's the difference, watch what the high performance Lippizans are capable of, as they're trained in many of the battle maneuvers.