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We have identified at least 11 instances in which a defense team sought to introduce “warrior gene” evidence, either to argue for a “not guilty” verdict or to push for conviction for a lesser crime to mitigate punishment.

The genetic argument can cut both ways: In a death penalty appeals case in Texas involving Amos Joseph Wells III, who killed his pregnant girlfriend and two other people, Wells’s lawyers note that prosecutors turned the “warrior gene” defense against him.

The rise and fall of the science underlying the warrior gene defense occurred in less than two decades.

It declined to dig into the research and warn other courts across the country about the speciousness of the warrior gene theory.

Yepez had sought at trial to introduce evidence that he had what’s been called the “warrior gene” — a version of a gene known as MAOA, which has been linked to violence in some studies.