Police didn’t always have the crime-solving methods and technology available today. Even the best detectives sometimes couldn’t gather enough evidence to solve crimes. This compelling book focuses on these cold cases, crimes that haven’t been solved after a complete investigation. Readers learn about painstaking detection techniques such as bloodstain analysis, ballistics, toxicology, and DNA profiling. These are just some of the invaluable tools of law enforcement referenced that are helping police solve the most perplexing cold cases. With innovative crime science teams on the job, hope remains that many cold cases can finally be cracked.