This involved obtaining scent samples from clothing that the victim was wearing at the time of his death and from six white males, including [Winfrey]. The dogs were "pre-scented" on the scent samples obtained from the victim's clothing. The dogs then walked a line of paint cans containing the sent samples of the six white males. All three dogs alerted on the can containing [Winfrey's] scent sample.When this scent identification was later admitted at Winfrey's capital murder trial, he was convicted and sentenced to 75 years in prison.
After the 11th Court of Appeals affirmed the conviction and sentence, the Texas Court of Criminal Appeals granted to review to address whether it was proper for the Court of Appeals to rely upon a dog scent lineup in determining that the evidence was legally and factually sufficient.
"Identifying someone's scent at a crime scene is not an indication of complicity," the CCA explained. The Court also noted, as originally stated by Supreme Court Justice Souter, that "[t]he infallible dog, however, is a creation of legal fiction." The CCA then went on to identify courts around the country that have held that dog-scent evidence, when admissible, is insufficient, standing alone, to sustain a conviction.
Like our sister courts across the country, we now hold that scent-discrimination lineups, whether conducted with individuals or inanimate objects, to be separate and distinct from dog-scent tracking evidence. Even the briefest review of the scientific principles underlying dog scenting reveals that, contrary to the conclusions of many courts, there are significant scientific differences among the various uses of scenting: tracking, narcotics detection, and scent lineups. Accordingly, we conclude that scent-discrimination lineups, when used alone or as primary evidence, are legally insufficient to support a conviction. Like the Supreme Court of Washington, we believe that [t]he dangers inherent in the use of dog tracking evidence can only be alleviated by the presence of corroborating evidence.Finding it "undeniable" that the jury and the Court of Appeals found the dog scent lineup evidence compelling, and further finding that there was no corroborating evidence placing Winfrey at the scene of the crime, the CCA reversed the lower court of entered a judgment of acquittal.
Takeaway: "[W]hile [dog scent lineup] evidence may raise a strong suspicion of [a person's] guilt, we nevertheless decide that, standing alone, it is insufficient to establish a person’s guilt beyond a reasonable doubt.