Thousands of investigative interviews, complex criminal investigations, and management at all levels of the police system enabled me to acquire specific security and investigative experiences. Scientific research, studying recent international literature and participation in numerous professional and scientific conferences and projects gave me a theoretical basis for understanding the possibility of wide application of criminalistics methodology. Almost 14 years of teaching experience helped me understand how to put the acquired theoretical knowledge and practical experience into the function of solving specific security problems in public and private security.