The book discusses some basic concepts relevant to the legal system, criminal laws and public health laws. These basic concepts will no doubt useful to authorities and law enforcing officers, specially to beginners and trainees to understand the legal system in Sri Lanka and legislative principles. Among laws related to public health in Sri Lanka, the book mainly focuses on the Food Act, National Medicine Regulatory Authority Act, National Authority on Tobacco and Alcohol Act, Quarantine and Prevention of Diseases Ordinance, Prevention of Mosquito Breeding Act and Statute of Preventing Public Health Nuisances of the Western Province Council.