05 blood group secret recorded in Japanese criminal investigation cases

This case is an unsolved case in the history of Japanese criminal investigation.

On the evening of June 9th 1990, the rainy season has stepped into the Kansai region faster than in previous years.

In the highland where children play in Lu Mei Park, Xiajing District, Kyoto Prefecture, a middle school in school uniform was found (Japanese middle school means junior high school in China, and the name of high school is the same. ) A woman's body.

Forensic examination results belong to suffocation death. And there are obvious signs of sexual assault. The victim's neck also had obvious subcutaneous congestion caused by rope tightening. Judging from the style of the school uniform and the name on it, the victim was a student from nine nearby middle schools. It was later confirmed that it was indeed Bozi Hasegawa (13), a junior high school student in Jiutiao Middle School.

Guankou and the third-grade students in the nearby primary school pay (8) to call the police through the public telephone set near the park.

She stopped moving, and then she stopped moving. Those people got away, not me.

This is the words that Guankou and Kazuo repeated intermittently on the phone with tears in their eyes.

He just waited there when the police told him not to go away. When he arrived at the scene, the eight-year-old boy who reported the case was soaked to the skin and incontinent. The glasses on the nose kept slipping because of sweat and tears. The weather in June, his eyes are numb and he has been shaking.

The victim Hiroshi Hasegawa has been dead for two or three hours. Kazuo Guankou said that he came to the park to play for a while after school (Japanese primary schools usually finish school around 3: 30 in the afternoon). Later, several junior high school students from a nearby middle school came to the park with the victim. He saw that they talked for a while at first, then there seemed to be an argument, and then there was entanglement and beating. He stood thirty meters away and looked at the unfamiliar scene curiously and nervously. The time matches.

The police found six semen marks on the inside of the victim's rolled-up school uniform skirt. After examination, it was identified as AB blood group. It should be the remains of the murderer.

Several teenagers were arrested soon. One * * * five people. But their blood types are O and B respectively. (Four people are type O, one is type B, and the primary school student who called the police is also type O).

What about them after the struggle?

They ... they left and said they were going to the aquarium to blow air conditioning. ...

This case is relatively simple. According to the confession of Guankou, the police arrested five teenagers involved. (12- 16 years old)

The Family Trial Chamber of the People's Court of Xiajing District, Kyoto City held a hearing. (Note: In order to protect the rights and interests of minors, Japanese courts do not hear all criminal cases of minors in public. )

The five teenagers first denied it collectively. He said that he only stayed at the scene for a short time and then left without any contact with the victim.

However, due to repeated confessions and questions from Guan Kou and Fu, how did they get there later? You didn't take me to the aquarium. After this correction, several teenagers were speechless and made some confessions similar to human contact with the victim and tightened their necks.

The family court of Xia Jing District Court delivered the trial result. Teenagers involved in gang rape and murder were sentenced to first-class and second-class juvenile reformatory respectively.

The suspect's parents appealed to the Hunan Intermediate People's Court, but they were rejected.

1994, the Guardian appealed again. Still rejected. The direct cause of the two appeals was that the semen blood type AB found on the victim did not match the blood types of several teenagers. The basis of the first-instance judgment of Xia Jing Family Court is unreasonable.

The case was circulated in the society at that time. The basis of the procuratorate is that blood type A and blood type B are mixed together and may be detected as AB blood in some special circumstances.

The media and relevant private investigation agencies said that this statement by the procuratorate is simply nonsense.

However, in fact, social statements were misled by the media.

Accurately speaking, the original opinion of the procuratorate on blood type is not as simple and vulnerable as reported by the media. Blood group identification in this case involves difficult blood group identification methods.

The general public did not know that the procuratorate's statement at that time was not that type A blood plus type B blood was equal to type A B blood. However, it is a type A antigen tissue substance, and the addition of type B antigen tissue substance will lead to different test results because of the different reaction intensity between them.

For example, when type A cell slices are mixed with type B saliva, the judgment result of red blood cells containing A B antigen may appear.

Blood judgment is different from other body fluids and biological tissues.

When this event was first heard in Xia Jing, the lectin absorption test was carried out. Before they formally convict these teenagers and send them to juvie.

That is to say, in this case, the blood or body fluids of type A and type B are aggregated together, and the test results are theoretically very likely to produce AB antigen results.

But this is only a possible result, and no conclusion can be drawn. This cannot be the basis for judging the guilt or innocence of B-blood teenagers or even other O-blood teenagers in this case. The Kyoto City Intermediate People's Court held that the original judgment that the juvenile committed a major crime was probably correct. According to the witness testimony and the timid confession of the juvenile involved at first, it can be judged that the case was indeed committed by him.

However, the defendant's defense lawyers, non-governmental investigation organizations and related organizations of the Youth Protection Association have taken six skin tissues and saliva in order to avoid taking too much body surface garbage when taking cells and body fluids. Common sense to judge the antigen test results contained in each tissue may not necessarily lead to the conclusion of AB type identification.

Inferred from probability, the results of lectin absorption test of six organizations were all AB type, which in fact proved that the prisoner was AB type.

Some people think that teenagers may leave the scene directly without killing people even after having sexual contact with the victims and some violent injuries. Then the real killer appeared. And the teenagers didn't carry rope weapons. The prosecution's statement that the B-blood teenager is a prisoner is very lacking in evidence. The previous confession in the family court is most likely due to excessive shock.

So in March, 1998, the Kyoto Prefecture High Court rejected the victim's parents' claim for compensation in civil proceedings against the arrested juvenile guardian.

It is necessary to strike while the iron is hot, and the parents of the teenagers involved also proposed to revoke the judgment that the teenagers involved were sent to juvenile detention center for rape and murder. Although the execution was completed at that time, the Japanese government also amended the law for this purpose, stipulating that even after the execution was completed, the decision to send him to the juvenile detention center could still be revoked. Leave more light for the future of teenagers.

The parents of the victims and a large part of the society have always regarded the juvenile as a prisoner with their attitude at that time, the consistency of confession and the results of lectin absorption test. There are no real criminals.

After several waves, some people took to the streets to protest against the non-governmental juvenile protection groups. Without much evidence, they still condoned juvenile offenders on the grounds of protecting juveniles. Justice for the dead.

15. The bones of the murdered girl Hiroshi Hasegawa are cold. However, the sadness brought by this case to the relatives and close friends of the victims will last for a lifetime.