Additional info. from DPCSO 2018 Report (i.e. unsolved cold cases, etc.). Some of this shows the limited amount of staff for the "Cold Case Unit". Still 50 "unsolved cold case murders" at the end of 2018.
The Cold Case Unit of the Sheriff’s Office is responsible for investigating any unnatural death or violent crime against persons that has not been resolved, generally, but not necessarily always, in a period that exceeds one year and is not actively being investigated. Solvability factors are applied to suspended cold cases to assist in identifying cases that can be reopened and actively investigated. In 2018, the Cold Case Unit was supervised by Sergeant D. Two detectives are currently assigned as Cold Case detectives, in addition to their primary duties as case detectives. As 2018 came to a close the Sheriff’s Office currently has fifty unsolved cold case murders and two missing person cases. As indicated in Fig. 1 to the left, the numbers of cold cases has declined in each decade since the 1970’s; with the 1970’s being an anomaly when comparing thirty years before and after that decade. Advances in investigative techniques, such as investigators interview and interrogation skills, along with technological advances in the areas of electronic tracking and data recovery via computers and cellular devices have changed drastically. Additionally, crime scene processing and evidence collection procedures have advanced significantly. Lastly, and along with the aforementioned advances, the ongoing progress in the field of Forensic Science, specifically, the advances in DNA testing, certainly contribute to the higher rate of solved homicides as demonstrated in the Kristina Wesselman case.