In many people's eyes, DNA detection technology is simply the ultimate artifact. Every time the case goes to the end of the mountain, a hair, a drop of blood, a little body fluid... But if you can bring a little bit of biological information, these seemingly inconspicuous evidence can be turned into a magical, open the crowd, pointing to the murderer .
But the question is: How reliable is DNA detection technology? Doesn't it make mistakes?
The case under the “Iron Certificateâ€
Houston citizen of the United States Carol? Batty originally expected DNA detection technology to prove his son Josiah? Sutton’s innocence, the result is counterproductive.
In 1998, 16-year-old Sutton and neighbor Gregory? Adams walked on the street and was referred to by a rape victim as the murderer. Both of them had proof of absence at the time of the incident and the body was very different from the victim’s description to the police at first. They hope that DNA technology can prove their innocence and agree to blood tests.
Police analyst Kristi in the Criminal Investigation Laboratory? After extracting DNA samples from the two people and the victim, Kim excluded Adams’s suspicion of the crime, but determined that the Sutton DNA was “consistent†with the victim’s vaginal swab collection. Soon, Sutton was sentenced to 25 years in prison for rape.
Batty asked for help from his son, but many lawyers refused to take over when they heard that the evidence involved DNA. It was not until four years later that she accidentally saw a survey program on the local TV station and rekindled hope.
According to this program, the Houston Police Criminal Investigation Laboratory, one of the leading public health centers in Texas, handles at least 500 cases of DNA evidence each year. According to the informant's report, the program team gave dozens of DNA maps of the laboratory to third-party experts for analysis, and found that police technicians often made mistakes even the most basic samples.
"If this can be incompetent," William William, a professor of criminology at the University of California, Irvine. Thompson commented, "They are seriously incompetent, and they are seriously and again and again."
After the program was broadcast, many people called the program group to talk about their experience of DNA detection. Sutton is one of the imprisoned. After the show group introduced Bhatti to Thompson, he and his wife, who are lawyers, found doubts from the two boxes of interrogation materials: To build a reliable DNA map for a person, the analyst needs to collect samples from multiple parts of the body. The DNA characteristics extracted from each sample should be identical. However, the data show that gold is very different from the DNA extracted from the victim's blood and a saliva.
Thompson said that if technician Jin did not get a consistent DNA fragment from the same person, how can she expect her to correctly distinguish individual DNA from vaginal swab collections that may have three human gene fragments? More importantly, according to the gold test, Sutton's DNA did not match the genetic markers extracted from the semen samples. The evidence is enough to prove that the boy is innocent, but "no one told the judge about the matter in the past."
Soon, Batty found a new lawyer, Sutton regained freedom, the real rapist was arrested in another case in 2006, and Kim was fired. But her lawyer said that this is not the fault of Kim, it is the failure of the entire system, such as poor supervision.
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