DNA is powerful but not infallible. Modern "touch DNA" can transfer secondarily - through handshakes, shared tools, or even clothing contact with someone who visited the scene. Crime lab contamination, mixed samples, and analyst error all produce false matches. We demand the full lab packet: the electropherograms, the mixture interpretation notes, the validation studies, the proficiency testing history of the analyst. When the science is shaky, we bring in independent forensic experts. Many burglary cases have been dismissed or reduced when the DNA evidence turns out to be statistically weak or procedurally mishandled. Never assume a DNA hit is the end of your case.