This publication is part of a larger research project, „Monitoring, identyfikacja i przeciwdziałanie zagrożeniom bezpieczeństwa obywateli” [Monitoring, identification and counteracting threats to citizen security], no. PBZ-MNiSW-DBO-01/1/2007, sponsored by the Ministry of Science and Higher Education and conducted as part of the Polish Platform for Homeland Security. The project coordinator is Professor Emil Pływaczewski, University of Białystok, Poland. As editors of this volume, we would like to express our special thanks to Professor Pływaczewski for his support for this volume and for ensuring us that it would be a good idea to study conflict of interests