SHREVEPORT, La. — The North Louisiana Crime Laboratory has joined 98 other forensic labs across the United States in implementing STRmix software, a technology designed to resolve complex or degraded DNA profiles.
While the lab is the 99th in the country to adopt the software, it is the first in the United States to validate the VeriFiler Plus PCR amplification kit with STRmix. This specific combination allows forensic scientists to utilize more information within a DNA profile to deconstruct complex mixtures.
"This advancement gives us the ability to interpret complex mixtures that were previously uninterpretable using binary methods," said Jessica Esparza, Ph.D., the DNA technical leader at the North Louisiana Crime Laboratory.
The laboratory serves the 29 northern parishes of Louisiana, providing forensic services from facilities in Shreveport and Alexandria, as well as an evidence hub in Ouachita. The new software is expected to assist in investigations involving violent crimes, sexual assaults and cold cases where evidence was previously dismissed as inconclusive.
Unlike older manual methods that rely on fixed thresholds and subjective analysis, STRmix uses a continuous model to assess DNA samples. The software can propose hundreds of thousands of different profiles and assign a likelihood ratio, which is the standard statistical approach for determining the weight of evidence.
Since its global introduction in 2012, the software has been used in more than 700,000 criminal cases worldwide. The North Louisiana Crime Laboratory's adoption of the tool is part of its ongoing mission to enhance crime detection and support criminal investigations across the region.
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