This book offers a comprehensive guide to criminal defense investigations, designed to benefit a diverse audience including novice and seasoned investigators, law enforcement officers, and criminal defense attorneys. It covers essential techniques for conducting effective investigations, illustrated with real case examples to show practical applications and provide a realistic view of the investigative process. Novice and experienced investigators alike can learn new methods and refine their skills, while attorneys can gain insights into what to expect from criminal defense investigators and how to effectively utilize their services. Law enforcement officers will find valuable information on understanding the approach and techniques used by criminal defense investigators, which can also be relevant to their own work.