40 GIULIANI AND GAGGIO v. ITALY JUDGMENT achieve these objectives. In any event, intentional lethal use of firearms may only be made when strictly unavoidable in order to protect life. 10. In the circumstances provided for under principle 9, law enforcement officials shall identify themselves as such and give a clear warning of their intent to use firearms, with sufficient time for the warning to be observed, unless to do so would unduly place the law enforcement officials at risk or would create a risk of death or serious harm to other persons, or would be clearly inappropriate or pointless in the circumstances of the incident. 11. Rules and regulations on the use of firearms by law enforcement officials should include guidelines that: (a) Specify the circumstances under which law enforcement officials are authorized to carry firearms and prescribe the types of firearms and ammunition permitted; (b) Ensure that firearms are used only in appropriate circumstances and in a manner likely to decrease the risk of unnecessary harm; (c) Prohibit the use of those firearms and ammunition that cause unwarranted injury or present an unwarranted risk; (d) Regulate the control, storage and issuing of firearms, including procedures for ensuring that law enforcement officials are accountable for the firearms and ammunition issued to them; (e) Provide for warnings to be given, if appropriate, when firearms are to be discharged; (f) Provide for a system of reporting whenever law enforcement officials use firearms in the performance of their duty. ... 18. Governments and law enforcement agencies shall ensure that all law enforcement officials are selected by proper screening procedures, have appropriate moral, psychological and physical qualities for the effective exercise of their functions and receive continuous and thorough professional training. Their continued fitness to perform these functions should be subject to periodic review. 19. Governments and law enforcement agencies shall ensure that all law enforcement officials are provided with training and are tested in accordance with appropriate proficiency standards in the use of force. Those law enforcement officials who are required to carry firearms should be authorized to do so only upon completion of special training in their use. 20. In the training of law enforcement officials, Governments and law enforcement agencies shall give special attention to issues of police ethics and human rights, especially in the investigative process, to alternatives to the use of force and firearms, including the peaceful settlement of conflicts, the understanding of crowd behaviour, and the methods of persuasion, negotiation and mediation, as well as to technical means, with a view to limiting the use of force and firearms. Law enforcement