TY JOUR TI SPECIAL LEGAL GUARANTEES OF ENSURING LEGALITY IN DISCRETIONARY LAW ENFORCEMENT KW special legal guarantees of legality KW discretionary law enforcement KW limits of law-enforcement discretion KW legal purpose KW legal principles KW legal presumption and fiction KW type and method of legal regulation KW competence of agencies and officials JO Volgograd Academy of the Ministry of the Interior of Russia AU , .. AU , .. PY 2013 IS PB Volgograd Academy of the Ministry of Internal Affairs of Russia