When a murder case goes to trial, the testimony of crime scene investigators often becomes the cornerstone of the prosecution’s case. The ability of CSI specialists to collect, analyze, and present physical evidence can mean the difference between conviction and acquittal. The 2016 murder trial of former Marine Christopher Brandon Lee demonstrates exactly how powerful CSI testimony can be in securing justice.
Key takeaway:
CSI specialists provide expert testimony by presenting physical evidence they’ve collected and analyzed from crime scenes. Their scientific approach and detailed documentation help juries understand complex evidence, as demonstrated in the Christopher Brandon Lee murder trial where CSI testimony proved crucial.
This high-profile case, which unfolded in the San Bernardino Criminal Courthouse, showcases the meticulous work of crime scene investigators and their vital role in the criminal justice system—understanding how CSI professionals like Susan Jaquez of the San Bernardino County Sheriff’s Department present evidence in court provides valuable insight for anyone considering a career in forensic science.
The Christopher Brandon Lee Murder Case
The prosecution of Christopher Brandon Lee for the murder of 19-year-old Erin Corwin represents a textbook example of how physical evidence builds a compelling case. Deputy District Attorney Sean Daugherty characterized the case as straightforward, stating that all evidence pointed directly to Lee as the perpetrator.
Erin Corwin, the wife of Marine Jonathan Corwin, disappeared on June 28, 2014. Her husband reported her missing that same day, triggering an intensive search operation that would involve multiple law enforcement agencies. Two days later, investigators discovered her abandoned vehicle, but Erin remained missing for nearly two months.
The breakthrough came when search teams located Erin’s body in a mine shaft near the Twentynine Palms Marine Base, adjacent to where Lee had been residing. The condition of the body and the evidence found with it would become central to the prosecution’s case. A garrote was wrapped around her neck, and investigators also recovered a propane tank wrapped with blue rope from the same mine shaft. According to the Department of Justice guidelines on evidence discovery, such physical evidence must be carefully documented and preserved for trial.
Lee had already left California by the time Erin’s body was discovered. After receiving a discharge from the military, he traveled to Alaska, where local law enforcement eventually apprehended him during a routine traffic stop. The Anchorage police officer discovered an outstanding warrant for Lee and impounded the Chevy Suburban he was driving, which was registered to his mother.
The Role of CSI Specialists in Court Testimony
Crime scene investigators serve as expert witnesses who bridge the gap between physical evidence and legal proceedings. Their testimony transforms technical findings into understandable information that judges and juries can use to make informed decisions. CSI specialists must possess not only technical expertise gained through comprehensive training programs but also the ability to communicate complex scientific concepts clearly.
In murder trials, CSI testimony typically covers several critical areas. First, they establish the chain of custody for evidence, documenting how items were collected, stored, and analyzed in accordance with protocols established by organizations such as the American Society of Crime Laboratory Directors (ASCLD). Second, they explain the significance of physical evidence and how it connects to the crime. Third, they present their findings in an objective, scientific manner that withstands cross-examination.
The credibility of CSI testimony depends heavily on proper training and expertise. Professional crime scene investigators undergo extensive education in evidence collection, preservation techniques, photography, and courtroom testimony preparation. While not required, professional CSI certifications can enhance a specialist’s credibility and are often considered by courts when determining expert witness qualifications. This preparation ensures they can effectively present their findings while maintaining scientific integrity.
Evidence Collection and Chain of Custody
The evidence collection process follows strict protocols to ensure admissibility in court. Crime scene investigators must document every step, from the initial discovery of evidence to its presentation at trial. This meticulous documentation creates an unbroken chain of custody that validates the evidence’s integrity, as outlined in NIST forensic science standards.
| Evidence Type | Collection Method | Documentation Required | Storage Requirements |
|---|---|---|---|
| Physical Items | Photograph in place, use gloves, seal in evidence bags | Location, time, collector’s name, case number | Secure evidence locker with controlled access |
| Trace Evidence | Specialized collection tools prevent contamination | Detailed notes on the collection technique and location | Climate-controlled environment, sealed containers |
| Digital Evidence | Forensic imaging, write-blocking devices | Hash values, acquisition logs, examiner notes | Secure digital storage with backup copies |
| Biological Evidence | Sterile collection tools, proper PPE | Collection method, presumptive test results | Refrigeration or freezing, as appropriate |
In the Lee case, investigators followed these protocols meticulously when collecting evidence from multiple locations. The mine shaft where Erin’s body was found presented particular challenges due to its remote location and the advanced decomposition of the remains. Crime scene investigators had to carefully document and preserve evidence while working in difficult conditions, similar to techniques taught in accredited forensic science programs.
Susan Jaquez’s Critical Testimony
Susan Jaquez, a crime scene investigator with the San Bernardino County Sheriff’s Department, provided pivotal testimony that connected Lee to the murder. Her professional expertise and detailed evidence collection proved instrumental in building the prosecution’s case. The responsibilities she demonstrated exemplify the critical role CSI specialists play in criminal investigations.
Jaquez testified about discovering bits of twine in Lee’s jeep that matched the twine from a torch found with Erin’s body. This seemingly small detail demonstrated the importance of thorough evidence collection and comparison. She also presented evidence showing that tire tracks found near Erin’s abandoned car matched Lee’s jeep, providing another crucial link between the suspect and the crime scene.
Her testimony extended to evidence collected from the Chevy Suburban that Lee was driving when arrested in Alaska. Inside the vehicle, investigators discovered a garrote similar to the one found wrapped around Erin’s neck. The garrote was constructed from braided parachute cord, PVC pipe, and electrical tape, showing premeditation in its construction. The FBI’s evidence collection procedures emphasize the importance of documenting such weapon construction details.
Additionally, Jaquez testified about finding a piece of blue rock climbing rope in the Suburban that matched the rope tied around the propane tank found in the mine shaft. These matching pieces of evidence created a compelling narrative that linked Lee directly to the murder weapon and the disposal site. Her ability to present this evidence clearly in court demonstrates the importance of communication skills developed through specialized CSI education.
Types of Evidence Presented
The Lee trial showcased various types of physical evidence that CSI specialists routinely encounter and analyze. Understanding these evidence categories helps aspiring crime scene investigators prepare for the diverse challenges they’ll face in their careers. The International Association for Identification provides detailed standards for handling each evidence type.
Trace evidence played a crucial role in this case. The matching twine fibers found in Lee’s vehicle and at the crime scene represented microscopic evidence that required careful collection and analysis. This type of evidence often provides the subtle connections that link suspects to crime scenes, as emphasized in professional CSI degree programs.
Pattern evidence, including the tire tracks near Erin’s abandoned vehicle, demonstrated how CSI specialists use comparison techniques to establish connections. Tire track analysis involves photographing and casting impressions, then comparing unique wear patterns and characteristics to suspected vehicles. This specialized skill is developed through hands-on training in forensic science associate degree programs.
Weapon evidence, particularly the garrotes found at the crime scene and in Lee’s vehicle, required careful documentation and comparison. The construction materials and techniques used in making these weapons provided valuable investigative leads and helped establish premeditation. Understanding weapon evidence analysis is a crucial component of bachelor’s degree programs in forensic science.
Digital Evidence and Cell Phone Analysis
Modern criminal investigations increasingly rely on digital evidence to establish timelines and locations. In the Lee case, FBI Agent Kevin Boles provided testimony based on cell phone data analysis that placed both Erin and Lee in the area where her body was found on the morning of her disappearance. The Scientific Working Group on Digital Evidence (SWGDE) establishes standards for this type of analysis.
Cell phone tower data creates a digital footprint that can corroborate or contradict suspect statements. This type of evidence requires specialized knowledge to collect and interpret correctly. Investigators must understand how cell towers communicate with phones and how to accurately interpret location data, skills taught in advanced master’s degree programs in forensic science.
The integration of digital and physical evidence demonstrates the evolving nature of crime scene investigation. Modern CSI specialists must be proficient in both traditional evidence collection techniques and emerging digital forensics technologies. This combination of skills enables comprehensive investigations in complex cases, which is why many professionals pursue continuing education in online forensic science programs.
How to Become a CSI Specialist
The expertise demonstrated by Susan Jaquez and other CSI professionals in the Lee trial highlights the extensive preparation required for this career. Aspiring crime scene investigators must complete specific educational and training requirements to qualify for these positions. The path typically begins with exploring comprehensive guides on becoming a CSI.
Most agencies require at least a bachelor’s degree in forensic science, criminal justice, or a related natural science field. Coursework typically includes crime scene photography, evidence collection procedures, criminal law, and preparation for courtroom testimony. Many programs also include internships that provide hands-on experience in real investigative settings. Students interested in this field should research top forensic science colleges to find accredited programs.
Beyond formal education, CSI specialists need specific skills to succeed in courtroom testimony. They must communicate clearly and confidently, remain composed under cross-examination, and explain technical concepts in layperson’s terms. These skills develop through practice and experience, often beginning during academic training in programs that emphasize practical application.
Courts evaluate expert witnesses based on education, experience, and demonstrated expertise. While certification is not required, professional credentials from organizations like the International Association for Identification may support the specialist’s qualifications. These certifications cover various specialties, including crime scene investigation, footwear and tire track analysis, and forensic photography. Maintaining these certifications requires ongoing education and professional development.
Career Outlook and Salary Information
The demand for qualified crime scene investigators continues to grow as law enforcement agencies recognize the value of scientific evidence in criminal prosecutions. California, where the Lee trial took place, offers powerful opportunities for CSI professionals, with major agencies in Los Angeles, San Diego, and San Francisco regularly recruiting qualified specialists.
According to the US. Bureau of Labor Statistics, forensic science technicians in California earn competitive salaries that reflect the state’s high demand for these specialists. The median annual wage for forensic science technicians nationwide stands at $64,940, with the top 10 percent earning more than $107,490 annually. Professionals can explore detailed CSI salary information by state to understand regional variations.
| Experience Level | National Average Salary | Typical Education Required | Common Job Titles |
|---|---|---|---|
| Entry Level (0-2 years) | $37,670 – $48,590 | Bachelor’s degree | CSI Technician, Evidence Technician |
| Mid-Level (3-7 years) | $48,590 – $64,940 | Bachelor’s + certifications | Crime Scene Investigator, Forensic Specialist |
| Senior Level (8+ years) | $64,940 – $107,490 | Bachelor’s + extensive certifications | Senior CSI, Lead Investigator, CSI Supervisor |
Career advancement in crime scene investigation often depends on specialized training and courtroom experience. Professionals who develop expertise in specific areas, such as bloodstain pattern analysis or digital forensics, can command higher salaries and take on more complex cases. The ability to provide compelling courtroom testimony, as demonstrated in the Lee trial, significantly enhances career prospects. Many professionals advance their careers through doctoral programs in forensic science for leadership positions.
Frequently Asked Questions
What qualifications does a CSI specialist need to testify in court?
CSI specialists must have a proper education, typically a bachelor’s degree in forensic science or a related field, complete agency training programs, and maintain accurate chain of custody documentation. Courts evaluate expert witnesses based on education, experience, and demonstrated expertise. While certification is not required, professional credentials from recognized organizations may support the specialist’s qualifications and enhance their credibility as an expert witness.
How long does it take to become a crime scene investigator?
Becoming a crime scene investigator typically takes 4-6 years. This includes earning a bachelor’s degree (4 years), completing police academy or specialized CSI training (3-6 months), and gaining initial field experience (6-12 months). Some positions may require additional certifications or advanced degrees, extending the timeline. Many professionals start with an associate degree in forensic science before pursuing further education.
What makes CSI testimony admissible in court?
CSI testimony must meet several criteria for admissibility. The evidence must have a documented chain of custody, collection methods must follow accepted scientific procedures established by organizations like NIST, and the investigator must be qualified as an expert witness. The testimony must also be relevant to the case and based on reliable scientific methods that can withstand scrutiny under the Daubert or Frye standards.
Can CSI specialists work on federal cases like the FBI?
Yes, CSI specialists can work on federal cases. The FBI employs forensic examiners and often collaborates with local CSI units on major cases. Federal positions typically require additional security clearances and specialized training in federal evidence procedures and the investigation of interstate crimes. Many federal agencies recruit from FBI-approved forensic science programs.
What technology do modern CSI specialists use in investigations?
Modern CSI specialists use advanced technology, including 3D crime scene scanners, digital photography equipment, alternative light sources for detecting bodily fluids, portable DNA analysis devices, and specialized software for pattern analysis. Digital forensics tools for analyzing cell phones and computers have become increasingly important in contemporary investigations, as established by the Scientific Working Group on Digital Evidence.
How do CSI specialists maintain objectivity when testifying?
CSI specialists maintain objectivity by focusing solely on physical evidence and scientific analysis rather than theories or opinions about guilt. They present findings without bias, acknowledge limitations in their analysis, and avoid drawing legal conclusions. Professional training emphasizes the importance of remaining neutral and letting evidence speak for itself, following guidelines from the American Society of Crime Laboratory Directors.
Key Takeaways
The Christopher Brandon Lee murder trial demonstrates the critical importance of CSI specialists in modern criminal justice. Susan Jaquez’s testimony showcased how meticulous evidence collection and analysis can build an irrefutable case against a suspect. Her work connecting trace evidence, pattern evidence, and physical items created a compelling narrative that helped secure justice for Erin Corwin.
For those considering a career in crime scene investigation, this case illustrates both the challenges and rewards of the profession. CSI specialists must combine scientific knowledge, attention to detail, and communication skills to serve the justice system effectively. Understanding the daily responsibilities of CSI professionals helps prospective students prepare for this demanding yet rewarding career path.
The evolving nature of crime scene investigation, incorporating both traditional evidence collection and modern digital forensics, offers exciting opportunities for the next generation of CSI professionals. As technology advances and investigative techniques improve, the role of CSI specialists in solving crimes and securing convictions will only grow more vital. Students can explore various forensic science scholarships to help fund their education in this field.
Ready to start your journey toward becoming a CSI specialist? Explore accredited forensic science programs and take the first step toward a rewarding career in crime scene investigation.
2024USS BureauUSS Labor Statistics salary and employment figures for Forensic Science Technicians reflect state and national data, not school-specific information. Conditions in your area may vary—data accessed September 2025.
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