"John Butler has produced a series of books detailing the major issues involved in forensic DNA typing. His latest book on advanced topics in DNA typing provides exceptional coverage of this complex and difficult topic. Through his work at NIST and his many collaborations with forensic analysts, Dr. Butler has kept up to date with all recent advances in the field. In his book he brings remarkable clarity through examples, diagrams, and case notes that is unsurpassed in any other text on the subject."