John Calvin Gaziano
Crime Scene Investigation Instructor and Consultant
Crime scene investigation instructor John Calvin Gaziano offers hands-on training for law enforcement agencies nationwide, backed by 32 years of experience. Independent forensic case review for attorneys.
- 32 years law enforcement experience (24 years in crime scene investigation and analysis)
- Sergeant, Fremont Police Department (CA) Crime Scene Investigation Unit; retired 2021
- Processed, analyzed, and reconstructed thousands of crime scenes
- Master of Forensic Science (National University) + Master of Science in Criminal Justice (San Jose State University)
- Published author on crime scene investigation and bloodstain pattern analysis (selected works below)
- Held IAI certification during Fremont PD service: Senior Crime Scene Analyst
- Held IAI certification during Fremont PD service: Bloodstain Pattern Analyst
- Qualified in court as a bloodstain pattern analyst
- Testified in court multiple times regarding crime scene investigation
- 32 years law enforcement experience (24 years in crime scene investigation and analysis)
- Sergeant, Fremont Police Department (CA) Crime Scene Investigation Unit; retired 2021
- Processed, analyzed, and reconstructed thousands of crime scenes
- Master of Forensic Science (National University) + Master of Science in Criminal Justice (San Jose State University)
- Published author on crime scene investigation and bloodstain pattern analysis (selected works below)
- Held IAI certification during Fremont PD service: Senior Crime Scene Analyst
- Held IAI certification during Fremont PD service: Bloodstain Pattern Analyst
- Qualified in court as a bloodstain pattern analyst
- Testified in court multiple times regarding crime scene investigation
Professional background in crime scene investigation
John Calvin Gaziano spent nearly 28 years with the Fremont Police Department during his 32-year law enforcement career, including more than 20 years in the Crime Scene Investigation Unit. During the latter part of his career, he supervised the unit as a sergeant before retiring in 2021.
Throughout his career, John processed, analyzed, and reconstructed thousands of crime scenes. His responsibilities included crime scene investigation, evidence documentation, forensic analysis, and reconstruction. His experience includes thousands of hours of specialized forensic training and extensive courtroom testimony involving crime scene investigation and bloodstain pattern analysis.
Education, teaching, and published work
John holds a Master of Forensic Science degree from National University and a Master of Science in Criminal Justice from San Jose State University. He also earned a Bachelor of Science degree from the University of California, Berkeley, and holds a Certificate of Achievement in Homicide Investigation from the Institute of Criminal Investigation (ICI).
John has lectured extensively to law enforcement, forensic science, and investigative groups throughout the United States and has provided forensic consulting and crime scene training since 2011. His instruction includes crime scene investigation, crime scene photography, bloodstain pattern analysis, and crime scene processing and documentation.
In addition to his casework and instruction, John has researched and written extensively on bloodstain pattern analysis and forensic documentation. He authored the 285-page manual Crime Scene Photography: A Practical Approach to Forensic Documentation (2026), developed specifically to support classroom instruction, practical exercises, and field application in his 40-hour Crime Scene Photography course. For his 40-hour bloodstain pattern analysis course, John also authored the 300-page manual Bloodstain Pattern Analysis: An Investigative Approach, 2026 edition. He contributed to Crime Scene Photography (2016), including a section on bloodstain pattern analysis photography and documentation, and completed his thesis, Reconstruction of Bloodstain Impact Patterns: Error Rates (2017).
John’s teaching emphasizes practical investigative skills, careful documentation, and hands-on instruction. His goal is to help attendees develop the knowledge and confidence to apply what they learn in the field.
The Reference Materials section includes professional reference materials commonly cited in forensic science and bloodstain pattern analysis.
What students and professionals say
Feedback from law enforcement personnel and forensic professionals who attended Pinnacle Forensics training.
Very knowledgeable instructor who breaks down difficult concepts into easy-to-remember concepts with insightful hands-on practicals.
Paul Richards
Fremont Police Department
John gave great lectures and included a lot of hands-on exercises. As someone new to this field, I feel confident enough to go and take photos at any scene.
Crystal Carbajal
Rockport Police Department
The instructor is extremely knowledgeable and helpful in trying to help others succeed. I would highly recommend this training to anyone working in crime scene investigation.
Noah Hood
Longview Police Department
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