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The serial homicide case in Baiyin City, Gansu Province refers to the 14 years from 1988 to 2002 in which 9 women were brutally murdered in their homes in Baiyin City, Gansu Province, and some of the victims had been sexually assaulted .
The murderer targeted the women in red, with cruel and concealed methods, causing huge social panic .
The police cross-checking confirmed that all 9 cases were committed by the same person .
In 2004, Silver City police released details of the case to the outside world, and offering a reward of 200,000 yuan, hoping to get the line cord
The case the time span of 14 years, although pipe murderer committing the crime of 11 cases, but very subtle, so the case has yet to make substantial breakthroughs
.
Another 14 years have passed in a blink of an eye, and the time has come to March 2016.
Through chromosome Y-DNA inspection, the police found that the Gao family in Chenghe Village was suspected of committing the crime, and fingerprints were recorded one by one
.
When Gao Chengyong's fingerprints and DNA were extracted, he panicked
What kind of technology is "Y-DNA chromosome test" that can solve the unsettled old case? It turns out that the Y-DNA chromosome test is simply a well-known paternity test technique
.
Why can a suspect be identified through Y chromosome testing? In terms of forensic science, two things must be done.
One is to determine the suspect’s personal place of life, which is the materials obtained on the spot
.
The other is to look for clues.
Through the chromosome Y-DNA test, the police found the suspects of the Gao family's crimes, which greatly reduced the range of possible murderers, and then it became easy to find the murderer by comparison
Skynet was restored without leaking, and the murderer who had been hiding for many years finally failed to escape the DNA testing equipment , and the anxiety of the local people could finally be restored to peace
