Law enforcement officers frequently face moral dilemmas and use discretion in their work. Three key areas of liability for police are discrimination, investigative practices, and use of force. Officers may use different levels of control including authority, persuasion, and physical force. Discrimination and racial profiling continue to be issues, despite some progress in areas like New Jersey. Undercover work and the use of informants and interrogation techniques also present ethical challenges. While some force is necessary, research links excessive force to factors like an officer's personality and lack of accountability within a police culture.