Sections

Drug Identification

The Drug Identification section analyzes solid and liquid samples for the presence of controlled substances. To meet accepted forensic standards the positive identification of a controlled substance requires two positive results from two diverse analytical methods.

Evidence Receiving

The Evidence Receiving Section is responsible for the intake, secured storage and release of submitted evidence, as well as, the associated data entry, record retention, and invoicing.

Firearms

The Firearms/Toolmarks section examines discharged bullets and spent cartridge cases recovered from crime scenes or at autopsy to determine the origin of the bullets and cartridge cases through comparisons with the discharged bullets and spent cartridge cases obtained from a known firearm. Additionally, the firearms analysts determine the mechanical functionality of recovered firearms and screen cartridge case evidence to determine suitability for entry into the National Integrated Ballistic Information Network (NIBIN) database for comparison with similar evidence from other agencies.

Bullet ComparisonCartridge Case Comparison

Firing RangeBullet Test Recovery Tank

Serology/DNA

The Serology/DNA section examines physical evidence collected through medical-legal and/or crime scene investigations to determine the presence of body fluids such as blood, semen, and saliva. The analysts compare the DNA profiles obtained from evidence body fluid stains with known DNA profiles of submitted known standard samples to identify likely sources of the unknown body fluid stains.

The section participates in the Combined DNA Index System (CODIS) allowing for the exchange of forensic DNA evidence across multiple jurisdictions.

Unless otherwise specified in a laboratory report, genetic profiles entered into CODIS are uploaded to the National DNA Index System (NDIS) and/or State DNA Index System (SDIS) and searched indefinitely. Should the genetic profile(s) match to another genetic profile in CODIS, the investigating agency will be contacted, as appropriate.

Trace Evidence

The Trace Evidence section examines crime scene physical evidence that is not analyzed by other sections, including:

  • Fibers
  • Glass fragments
  • Gunshot/explosive residues
  • Paint

The Trace analyst must often develop unique approaches and combinations of analytical techniques to fully analyze the complex and varied submitted evidence. We strongly recommend that each customer discuss his/her specific requirements with a Trace analyst prior to the submission of the crime scene evidence.

CRIMINAL INVESTIGATIONS LABORATORY

  1. Location


    7337 Louis Pasteur Drive San Antonio, Texas
  1. Operating Hours


    Monday - Friday 
    8 AM to 5 PM