A realistic training program in the use of deadly force focus on nine basic elements of discretionary shooting: threat recognition; reaction to the threat; use of clear, concise verbal commands; practice in confronting hostile subjects and environments; use to cover and concealment; counting rounds fired by the officer and the suspect to determine weapon status; mental conditioning; accuracy in hitting the target; and the ability to justify legally the use of deadly force. While expensive and time consuming, simulated exercises using laser equipment are realistic, as are interactive video exercises such as the Firearms Training System (FATS).