Dr. Butler takes a very complex subject and makes it easy enough for the novice to understand, yet is comprehensive enough for the professional research analyst. It is full of excellent research and observations on one of the most exciting and innovative technologies in DNA research that has been discovered in recent years. This book, without a doubt, will stand the test of time as being the authoritative reference on DNA forensic research. This book is packed with research and information that will enlighten you to the technological breakthroughs that are being made in forensic science. I have heard Dr. Butler speak and read several of his papers. He is without question the expert in DNA analysis with STR markers and this book has the distinction of being the best book ever written on the subject. Get this book, study it and find out why STR markers are the groundbreaking method for DNA analysis. If you are in any way involved with DNA research, you will find this book a desktop reference you will turn to again and again.