Mandatory Supervision was amended in 1987 to exclude violent criminals. But any violent criminal convicted in Texas before 1987 is still eligible for early release, according to the guide.
"Genene Jones has been eligible for parole since 1989, and every three years since 1989 her case has been renewed and parole been denied," Harry Batson, a public information officer for the Texas Board of Pardons and Parole, told ABC News.
"But mandatory release has nothing to do with parole," Batson said. "Even though she has been continually denied parole, that has no bearing on her release."
"During Jones' earlier parole hearings there was always a great deal of public outcry, people being upset that she could get out. But people forget. This happened so long ago, not that many people are aware, or care," Sutton said.
There is only one way to ensure that Jones stays in prison, authorities said.
"We need to find another case, another victim, whose death we can charge her with sufficient evidence," Andy Kahan said.
Kahan, as well as Sutton and some of Jones' former co-workers, suspect that she is responsible for the deaths of between 11 and 46 other infants who were patients at Bexar County Hospital between 1978 and 1982.
Jones was hired as a nurse in Bexar County Hospital in 1977, Cheryl Pendergraph, a nurse who worked on the same shift as Jones, told ABC News.
"I was working in the pediatric ICU of Bexar County Hospital from 1976-1981," said Pendergraph, who is now 59 and living in Houston. "I began as a clinician and eventually became a shift supervisor. Besides taking care of patients, my job was to give patient assignments to the nurses."
Pendergraph was the first nurse who worked with Jones when Jones was hired in 1977.
"Jones was assigned to my shift the first night after she was hired," Pendergraph said.
A few years later, in 1981, Pendergraph and the other nurses in the pediatric ICU noticed a significant increase in the unit's infant mortality rate.
"Our infant mortality rate was much higher in 1981 than it was in previous years," Pendergraph said. "During one of the midnight shifts the nurses and I got together. We had all noticed the increased deaths."
Pendergraph reviewed the patient logbooks and noticed what she said was a troubling pattern.
"Most of the deaths were on the 3-11 shift, which was the shift that Genene Jones worked on. And most of the infants who died were Genene's patients. She was assigned to them," Pendergraph said.
Joyce Riley was a nurse consultant who was also working at Bexar County Hospital.