Clinical Laboratory (Testing / Safety) Expert Witnesses: 9

George Schiro is a DNA Technical Leader - Forensic Scientist. His duties include incorporating the DNA Advisory Board (DAB) standards, accountability for the technical operations of the lab, conducting DNA analysis using the 13 STR core loci and Y STR in casework, DNA research, forensic science training and crime scene investigation.

Mr. Schiro has worked over 3500 cases and has qualified as an expert over 175 times in 31 Louisiana parish courts, Arkansas, California, Florida, Mississippi, Missouri, Nevada, New York, Texas, West Virginia, federal court, U.S. court-martial, and two Louisiana city courts. Has also consulted on cases in 29 states.

Qualified as an Expert in the Following Areas:

Gary D. Fletcher, PhD,  is the Founder and Principal Consultant at RnDDx Solutions LLC, a consulting firm founded in 2015, focused on Industrial Mechanical Engineering and Biomedical Engineering and Research and Product Development.  In his 30 years of experience, he has been co-inventor on 23 patents for devices and methods in blood collection and processing.

Litigation Support - Dr. Fletcher has subject matter expertise in Medical Device Mechanical Engineering and subject matter expertise in Medical Devices for blood and specimen collection and sample processing for in vitro diagnostics, point of care diagnostics, and therapeutics, including glucose monitoring. He serves as an expert witness in patent infringement cases involving medical device and diagnostic biomedical engineering, blood collection, separation, fluidic preparation, glucose monitoring, and cell therapy preparation devices.

Dr. Fletcher offers patent litigation services to law firms and lawyers supporting medical device and diagnostic industry clients, who need physical science and mechanical and biomedical engineering expertise for District Court, PTAB, and ITC patent cases. As an industry consultant, his ideal clients are R&D, product development, and innovation leaders in startup, emerging, and established medical device and diagnostic companies, who face product development and competitive challenges.

Areas of Expertise:

Dr. Fletcher is an entrepreneurial executive with expanding R&D roles in business, technology, and new product development leadership and execution, building and guiding teams in both Fortune 500 and startup companies. With a PhD in physics from Yale, he has a proven record of leadership in creating innovative new businesses and products in healthcare, medical devices, diagnostics, life, materials, and optical sciences.

Sara J. Schreiber, PhD, D-ABFT-FT, is a worldwide leader and highly accomplished Forensic Toxicologist, Educator, and Consultant whose work has earned recognition at both the national and international levels through leadership, teaching, professional service, and participation in major forensic pursuits.

Dr. Schreiber has more than two decades of experience in forensic science, including over 25 years in Toxicology and Controlled Substance Analysis, and has served in senior laboratory, technical director, academic, and expert roles in governmental forensic institutions.

Litigation Support - Dr. Schreiber provides comprehensive technical review and expert analysis in complex criminal and civil matters where alcohol, drugs, and poisons are at issue. Her work bridges the gap between advanced toxicological data and the courtroom by critically evaluating laboratory methods, case files, bench notes, instrumental data, and reports to determine whether testing, interpretation, and quality practices meet accepted forensic and accreditation standards, including ISO/IEC 17025, American Board of Forensic Toxicology (ABFT), and relevant professional guidelines. 

Dr. Schreiber draws on her experience as a diplomate of the American Board of Forensic Toxicology and her leadership roles in organizations such as MAFS, SOFT, NAME, OSAC, and TIAFT. When requested, she provides clear, accessible expert testimony, affidavits, and consultation to attorneys, investigators, and courts, translating complex toxicological and medicolegal issues into opinions that can be understood and evaluated by judges and juries.

Areas of Expertise: 

Background Experience - Dr. Schreiber’s national notoriety is reflected in her repeated invitations to lecture, train, and present on forensic toxicology, opioid deaths, toxicology trends, medicolegal death investigation, expert testimony, and related forensic topics for professional associations, public defenders, prosecutors, medical and university audiences, public health groups, and scientific meetings across multiple states throughout the US. Her work has also contributed to public-health and death-investigation initiatives through overdose fatality review teams, national overdose fatality review consulting, Department of Justice (DOJ), National Institute of Justice (NIJ), and the RTI Center for Forensic Sciences technology Working Group participation, and overdose-related strategy teams.

Dean S. Molnar, Jr. is a highly trained and exceptionally experienced Firearm and Tool Mark Examiner, Crime Scene and Firearms Trajectory Analyst, and a proven leader in the field of Forensic Science Operations and Quality Assurance. Mr. Molnar has over 25 years of experience as a certified law enforcement officer and State Trooper, and over 17 years of experience serving as a firearm and tool mark examiner, firearms and tool mark unit supervisor, and laboratory director with the Michigan State Police (MSP) Forensic Science Division.

Litigation Support - Mr. Molnar's experience as a forensic firearm and tool mark examiner includes recognized expert testimony in over 140 criminal cases in both state and federal courts involving both firearms and tool mark identification, crime scene investigation, and shooting reconstruction.  He has personally processed over 60 homicide scenes during his career, including scenes involving shooting reconstruction, photography, and documentation.

Areas of Expertise:

• Firearms function, operability, alterations, defects, conversions, modifications, accidental discharge
• Cartridge manufacture and source determination of ammunition components
• Shooting scene (trajectory) reconstruction
• External and/or terminal ballistics calculations and determinations of the projectile’s trajectory, ricochet, penetration, etc
• Distance determinations (muzzle-to-target determinations) from gunshot residue patterns or shot pellet patterns
• Serial number restorations (firearms, motorcycles and other vehicles, bicycles, etc.) – anything with an identifying characters, numbers or markings that have been obliterated either intentionally or by wear or corrosion

Background Experience - Mr. Molnar’s leadership experience has included firearms unit supervisor duties at three different laboratories. He currently serves in a key role as the Laboratory Director at the Michigan State Police-Lansing Laboratory where he is specifically assigned as the operations director for pattern disciplines.

Mr. Molnar also has over seven years of quality assurance experience as an ANSI National Accreditation Board (ANAB) assessor. His years of experience include almost 15 years of ongoing training within an extremely professional and accredited crime scene processing program at MSP, along with even more specialized training in firearms trajectory analysis. Mr. Molnar holds a Bachelor of Science in Fire Science and a Bachelor of Science in Criminal Justice from Lake Superior State University. He is a long-time member of the Association of Firearms and Tool Mark Examiners (AFTE) and is also a member of the American Society of Crime Laboratory Directors (ASCLD).

Robert J. May has a distinguished career spanning more than 30 years, with experience in Forensic Analysis, Executive-level Management, and Quality Assurance. He is a Latent Print Examiner with nearly 25 years of experience and has been a consultant with Riley, Welch, LaPorte and Associates for roughly 20 years.

Litigation Support - Mr. May has conducted latent print casework and technical reviews across the United States and beyond, having been qualified as an expert witness across multiple jurisdictions. He provides clear, accessible expert testimony, affidavits, and consultation to attorneys, investigators, and courts, translating complex latent print, crime scene, and forensic imaging issues into opinions that can be understood and evaluated by judges and juries. Mr. May has never been excluded as an expert or from testifying as an expert witness in any County, State, Federal, Arbitration or Administrative proceeding. 

Areas of Expertise:

• The Use of Automated Fingerprint Identification Systems (AFIS)
• Fingerprint Comparison and Identification Methodology
• Digital Enhancement Techniques
• Crime Scene Processing
• Evidence Processing and Documentation Using a Variety of Physical and Chemical Techniques
• Latent Print Visualization Using Alternate Light Sources and Lasers
• Subject Matter Expert in Digital Photography (taught crime scene and general photography for multiple agencies)

In addition to technical acumen in his forensic specialties, as a Laboratory Executive, Mr. May is a recognized leader in the forensic community. He has served as a laboratory director across multiple systems, with broad knowledge of lab operations, facility design, policy development, budgeting, human resources, metrics, process evaluation, and more.

Background Experience - Mr. May has a diverse background in both forensics and law enforcement. Prior to his current position as the Crime Lab Manager for the Corpus Christi (TX) Police Department’s Forensic Services Division, Mr. May spent 26 years as a trooper with the Michigan State Police, one of the nation’s premier law-enforcement agencies. Aside from considerable knowledge of general investigations and law-enforcement operations, his deepest expertise, and greatest passion, lies with forensic science. Mr. May spent most of his career within the MSP Forensic Science Division, beginning as a technical expert in latent prints, crime scene investigation, and forensic photography. He rose to the position of supervisor in latent prints and was ultimately promoted to laboratory director at the Sterling Heights Laboratory in Metro Detroit. He retired in 2020 as a decorated command officer with multiple commendations to his name, including awards for professional excellence and lifesaving, among others.

Ryan Larrison is a senior forensic science and public sector executive with over 25 years of experience spanning Forensic Laboratory Operations, Quality Assurance, Firearms Examination, and large-scale Program and Systems Management within the Michigan Department of State Police.

Mr. Larrison currently serves in a senior leadership role within the Information Technology Division, where he directs a multi-million-dollar portfolio of enterprise systems, operations, and project delivery. In this capacity, he oversees complex, multi-agency initiatives, aligning technical execution with operational and investigative outcomes across multiple state departments. His work includes executive sponsorship of statewide technology programs and the coordination of vendors, stakeholders, and cross-functional leadership teams in high-risk, high-visibility implementations.

Litigation Support - Mr. Larrison serves as an expert witness in cases involving laboratory analysis or laboratory quality assurance. He has been deposed and/or testified over 200 times in the past 5 years.

Areas of Laboratory Expertise:

Background Experience - Prior to his current role, Mr. Larrison served as Assistant Division Director and Quality Assurance Manager for the Michigan State Police Forensic Science Division. In that role, he was responsible for the strategic direction, implementation, and oversight of quality systems across seven accredited forensic laboratories. He led all quality assurance activities, including training, corrective action programs, risk assessment frameworks, and accreditation compliance under ISO 17025 standards. His leadership resulted in a substantial reduction in non-conformities and sustained accreditation across all laboratory operations. 

Mr. Larrison has extensive experience as a program executive and project sponsor for complex forensic and evidential systems. He directed the statewide implementation of the Evidential Breath Alcohol Testing Program, including instrument selection, software integration, vendor coordination, and regulatory compliance, supported by a $2.5 million procurement process. He also led the development and implementation of a Forensic Genetic Genealogy program, establishing quality expectations, vendor deliverables, and investigative reporting standards.

Kirk DeLeeuw is a highly regarded and accomplished Forensic Biology and DNA Consultant / Expert Witness both nationally and internationally. He has over 20 years of dedicated experience in Molecular Biology and Forensic Science and is well respected worldwide.

Mr. DeLeeuw's career is defined by a deep technical mastery of DNA analysis, including specialized expertise in interpreting complex multi-contributor samples using Probabilistic Genotyping Software (PGS) such as STRmix. Mr. DeLeeuw is licensed by the Texas Forensic Science Commission. He likewise has a comprehensive understanding of FBI Quality Assurance Standards (QAS) and ISO/IEC 17025 accreditation requirements. He applies the standards through meticulous auditing of case files, bench notes, and high-volume electronic data files and images.

Litigation Support - Beyond the laboratory, Mr. DeLeeuw is a seasoned Expert Witness, qualified to provide testimony in Body Fluid Identification / Serology and DNA Analysis across numerous jurisdictions. He has provided sworn affidavits and oral testimony in federal, circuit, and district courts in many states including Washington DC, and internationally in the Royal Turks and Caicos Islands. His ability to translate sophisticated molecular biology data into clear, accessible testimony ensures that scientific integrity remains paramount during both civil and criminal litigations.

Mr. DeLeeuw maintains technical proficiency through a rigorous commitment to continuing education, frequently attending the International Symposium on Human Identification and National CODIS Conferences. His hands-on experience spans a wide array of instrumentation, including Applied Biosystems Genetic Analyzers and Hamilton robotic workstations, as well as various quantification and amplification kits. This combination of technical expertise, regulatory knowledge, and proven courtroom experience allows him to provide unparalleled oversight and analysis in the field of forensic DNA.

Areas of Expertise:

Background Experience - Mr. DeLeeuw's extensive professional background includes high-level roles across private and public sectors. As a Forensic DNA Analyst at DNA Labs International, he analyzed casework from across the United States and internationally, utilizing advanced PCR/STR-based methods and various chemistries. Prior to that, he served for nearly 20 years as a Forensic Scientist for the Michigan State Police.

Rudolph Johnson, PhD, is a Chemical Toxicologist with over 20 years of experience in analytical chemistry and toxicological investigations. Dr. Johnson's past experience includes directing the (1) clinical toxicology network, LRN-C, at the Centers for Disease Control and Prevention and (2) the Military Exposures Research Program at the US Department of Veterans Affairs. Currently, he serves as the Director of the Wisconsin State Laboratory of Hygiene and has a faculty appointment at the University of Wisconsin-Madison School of Medicine and Public Health, Department of Pathology.

Dr. Johnson focuses on two specialty areas:

(A) Toxicology: He offers causation opinions connecting dose, analytical detection, and biomarker findings to determine whether and to what extent an individual was exposed to a chemical or toxin.  The chemical or toxin may be inhaled, ingested or injected. This includes drug and alcohol testing.

(B) Laboratory Testing: He critiques or defends laboratory testing methodology, chain-of-custody, and quality assurance practices. He is an expert at evaluating conflicting testing data between two labs.

Litigation Support - Dr. Johnson works with plaintiff and defense litigation attorneys on toxic tort, product liability, and environmental and occupational exposure cases requiring causation analysis. He supports criminal defense and plaintiffs reviewing drug exposures (opioids, fentanyl analogs, polypharmacy) and alcohol testing. This includes chain-of-custody, and quality practices. Conflicting or inconsistent laboratory data, especially between multiple laboratories, is a specialty area of Dr. Johnson because he previously directed multiple clinical toxicology labs.

Dr. Johnson detects, quantifies, and interprets chemical and toxic exposure in human clinical samples. He is skilled in translating investigative information into causation opinions, connecting dose, biomarker significance, and clinical outcome—for poisoning, occupational, environmental, and mass-casualty toxicology cases.

Areas of Expertise:

EXPERTISE IN: 1. The pathobiology, clinico-pathologic correlation, and histopathologic diagnosis of: diseases of the esophagus, stomach, small intestine, colon, rectum, anus, liver, and pancreas. 2. Human neoplasms (cancer) and preneoplastic conditions. 3. Establishing standard of care, causation and cause of death. 

BACKGROUND: 

1. Anatomic Pathology Residency: Washington Univ-Barnes Hospital 1991-94.
2. Oncologic Pathology Fellowship: M.D. Anderson Cancer Center 1994-95.
3. Gastrointestinal and Liver Pathology Fellowship: Harvard-Brigham & Women's Hospital 1995-96.
4. Instructor at Harvard Medical School: 1996-1998.
5. Assistant Professor and Director of Gastrointestinal Pathology Division at UT-Health Science Center-Hermann Hospital, Houston Medical Center: 08/1998 - 12/2000.
6. Staff GI Pathologist and Quality Assurance Director at Caris/Miraca Life Sciences, Dallas TX: 01/2001 - 04/2012.  Dr. Torres was instrumental in creating a unique model of Gastrointestinal Pathology subspecialty-focused laboratory, during his tenure at Caris/Miraca Life Sciences.
7. Staff Pathologist, Anatomic Pathology Division of the North Shore-LIJ Health System, Long Island NY: 05/2012 - 05/2015.
8. Staff Pathologist, Anatomic Pathology Division of Alliance Health Sciences, Dallas TX: 06/2015 - 05/2020.
9. Sole Proprietor of Expert Pathology Consultation Services Laboratory since 01/2020, which provides diagnostic pathology services to hundreds of clinicians of different subspecialties.