Magic bullet format has been used for easy understanding and quick revision. It covers all the topics required for theory, viva-voce and practical. Line-diagrams, flow charts, boxes, tables and differentiations have been added wherever possible to make the subject interesting, easy to understand, clear the concepts, recollect and reproduce during examinations. Color plates for poisons for easy identification, and some of the line-diagrams are colored for better understanding.Questions are given at the end of each chapter which are divided into Must know and Desirable to know followed by latest topic wise MCQs given from previous PG entrance examination. All the chapters have been revised and updated. Various new Acts (The Juvenile Justice Act, 2015; The Mental Healthcare Act, 2017; The HIV and AIDS Act, 2017; The Criminal Law Ordinance, 2018) have been added. Some older terminologies and concepts have been removed and newer ones introduced. Mnemonics have been included for easy recollection and reproduction Recent advances (skeletal age assessment, time since death, diagnosis and treatment of various poisons, etc.) have been incorporated wherever required. Important sections of IPC, CrPC and IEA are given in a single table. Application of nano-medicine in toxicology has been highlighted in some of the chapters.