I would add Education to the forefront of accountability. Police officer careers require no more education than a high school diploma/GED and the police academy, which is roughly 27 weeks. Imagine if being a police officer meant having a deep understanding of ethics, psychology (not just tactics) and law.

Stop accepting any physically fit hothead off the street because they can be trained into the role. Lastly, as a citizen, be willing to pay more in taxes knowing that the person who pulled you over cares, is qualified, and will not shoot you and try to cover it up.