
Criminal Defense Investigator – Los Angeles
Superior Court Bar Panel
Pretrial Investigations
1933 S. Broadway, Suite 1102
Los Angeles, California 90007
(213) 263-6864 | JAhrens@LAPretrial.com
Criminal Defense Investigator specializing in homicide and other Grade 4 felonies, with emphasis on reviewing law-enforcement investigations and locating, interviewing, and assessing witnesses. Employed continuously in criminal defense investigations since 2003; licensed California Private Investigator since 2021. Experienced in complex felony litigation support, evidence review, and coordination with court-appointed and private counsel throughout Los Angeles County and surrounding jurisdictions.
LICENSING & CERTIFICATIONS
• California Private Investigator / Qualified Manager – PI-189212
• Graduate, California Defense Investigators Training Academy
• Advanced Homicide Defense Training, California Attorneys for Criminal
Justice
CRIMINAL DEFENSE EXPERIENCE
Roberts & Roberts, Attorneys at Law – Los Angeles, CA
In-House Criminal Defense Investigator (2003 – 2021)
• Conducted investigative support for felony and misdemeanor cases,
including homicide, assault, and gang-related prosecutions.
• Interviewed clients, witnesses, and victims; prepared written summaries for attorney review.
• Assisted with evidence analysis, scene documentation, and jury-preparation materials.
• Worked closely with trial counsel to locate exculpatory evidence and develop alternative defense theories.
Platt College – Anaheim, CA
Adjunct Instructor, Criminal Justice (2016 – Present)
• Teaches coursework in criminal procedure, evidence, and investigative methods.
• Provides practical instruction drawn from field experience in homicide and felony defense investigations.
Pretrial Investigations – Los Angeles, CA
Criminal Defense Investigator (2021 – Present)
• Conducts homicide and major-felony investigations for retained and appointed counsel.
• Reviews police reports, discovery, and forensic evidence to identify inconsistencies and impeachment material.
• Locates, interviews, and obtains statements from civilian and law-enforcement witnesses.
• Prepares comprehensive defense reports, timelines, and trial exhibits for courtroom use.
• Coordinates with experts, mitigation specialists, and attorneys to develop
defense strategy.
MCLE INSTRUCTION
Continuing Legal Education Instructor – Alternative Sentencing in Criminal Cases
Develops and presents MCLE-accredited training for attorneys and defense
investigators focusing on sentencing alternatives, mitigation strategies, and community-based rehabilitation programs.
EDUCATION
• A.A. – Coastline Community College
• B.A. – University of North Dakota, Magna Cum Laude
PROFESSIONAL AFFILIATIONS
California Defense Investigators Association • California Attorneys for Criminal Justice
• California Public Defender’s Association • Los Angeles County Criminal Courts Bar Association
• California Association of
Licensed Investigators