Challenging Forensic DNA Evidence in Louisiana: A Defense Strategy Guide
                     Challenging Forensic DNA Evidence 
in Louisiana: A Defense Strategy 
Guide
In today's Louisiana courtrooms, forensic DNA evidence is frequently considered as an 
unbeatable "gold standard." However, being a criminal defense attorney possessing a 
Master’s Degree in Forensic DNA and Serology, I personally experienced that the "science" 
depends on the techniques of sampling, processing, and interpreting. The Ambeau Law Firm 
holds a position that a DNA match does not signify the closure of a case; it usually marks the 
commencement of a thorough technical dispute.
The Myth of Infallibility
In the opinion of most defendants in Baton Rouge and the rest of South Louisiana, a DNA 
match guarantees their conviction. It is a false notion. Every single step of the process 
dealing with forensic DNA analysis is prone to human mistake:
● Contamination: Improper handling by first responders or lab technicians can 
introduce foreign DNA.
● Secondary Transfer: Your DNA can end up at a crime scene you never visited 
simply by touching an object or person that later moved to that location.
● Complex Mixtures: When DNA from multiple individuals is found on a single 
item, the software used to "unmix" it can produce statistical errors.
The Ambeau Law Firm Strategy
When Jarrett Ambeau takes on a case involving forensic evidence, we don't just read the 
lab report; we audit the entire scientific process. Our defense strategy involves:
1. Bench Note Review: We examine the raw data and handwritten notes of the state's
analysts to find inconsistencies.
2. Challenging the Chain of Custody: We verify that the evidence was never 
compromised from the crime scene to the Louisiana State Police Crime Lab.
3. Expert Testimony: We utilize our deep understanding of molecular biology to 
cross-examine state experts and present a clearer, more accurate scientific narrative 
to the jury.
Why the Expert Matters
Winning a legal battle is not only about being well-versed in the law but also about being able
to skillfully counter scientific evidence. Jarrett Ambeau is one of the few lawyers who can 
manage a felony jury trial of more than 50 cases combined with scientific expertise to 
safeguard the rights of defendants.
When you are under accusation in the 19th Judicial District or its neighboring parishes, do 
not take for granted that the evidence presented by the state is true. Get in touch with the 
Ambeau Law Firm based in Baton Rouge and let them prepare your defense utilizing the 
truth, science, and vigorous advocacy.
Thank You!
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