ALISON STEWART:

In 1993, Cacy – a wife and mother of three grown children – was convicted in a jury trial and later sentenced to 99 years in prison.

But a relatively new Texas law could change Cacy's life. It's known as the "junk science law." The law offers a direct path to appeal when there is scientific evidence that was not available at the time of the conviction or there is new evidence that contradicts what was used to convict. Before the law, it was impossible in Texas to appeal a conviction based only on flawed scientific evidence.

When the Innocence Project of Texas took Cacy's appeal, attorneys immediately questioned the toxicologist's results, specifically a chromatography test, which separates mixtures found at crime scenes to detect molecules like those from gasoline.