What’s the role of forensic evidence in Georgia criminal defense?
Forensic evidence ties a person to a place or an object, but it’s limited to what the method can actually support. Defense work asks what the test really shows, what it doesn’t show, and whether it’s been fairly presented.
| Type | Strength | Weakness to test |
|---|---|---|
| DNA | High for a single source | Mixtures, transfer, low-level samples |
| Fingerprints | Depends on examiner comparison | Subjective; partial prints |
| Firearms and toolmarks | Comparison | Subjective; error-rate debate |
| Bite marks | Weak | Heavily criticized |
| Hair | Limited | Microscopic comparison has been discredited |
| Blood spatter | Interpretive | Experience-based |
| Digital | Metadata | Attribution and timing |
| Drug testing | Chemical | Lab practice, chain of custody |
The 2009 National Academy of Sciences report and the 2016 PCAST report can be cited in challenges to pattern evidence.
Legal controls. O.C.G.A. § 24-7-702 governs admissibility. Section 17-16-4 requires reports in discovery where the defendant has opted in. An indigent defendant may seek funds under Ake v. Oklahoma (1985). Confrontation requires a live analyst under Melendez-Diaz (2009).
Using it for the defense. Forensic results can help. A lack of DNA on a key item, a third party’s print, or a lab’s negative test may support the defense, though absence alone isn’t proof. A person’s own test may be requested, but a result could be discoverable if the expert is called.
After conviction. O.C.G.A. § 5-5-41(c) allows requests for DNA testing under listed conditions.
General information about Georgia law as of November 2026. It is not legal advice and does not create an attorney-client relationship.