The Handbook for Investigation of Poaching is designed to improve the effectiveness and coordination of measures for dealing with criminal offences associated with the illegal killing of wild mammals and birds. It lays out the key jurisdictions, tasks, and measures for field staff (hunters, gamekeepers, forestry workers, representatives of the Slovenia Forest Service, etc.), the police, the Veterinary Hygiene Service, the Veterinary Faculty, the Biotechnical Faculty, the Institute for Nature Conservation, the Slovenian Environment Agency, and other competent legal persons in the detection and investigation of such criminal offences. Appropriate organisation of all competent physical and legal persons improves the detection and prosecution of criminal offences, and reduces the number of illegal killings of wild animals.