Police explained silver killings detected: DNA storage than identifying suspects
Police released the suspect images.
Gansu Provincial Public Security Bureau informed the 24th Silver "8·05" series of rape murder case detected. Reporters from Gansu province, police learned, for 28 years, is the key to the "century cold case" fingerprints of 230,000. 2015, the grip in Gansu province, Chinese public security fingerprint and DNA evidence two down, build DNA gene pool in the province, realize the whole entry offenders, provides key infrastructure for the detection of the case.
Secret 1
Mapping the toilets all day squat
From 1988 to 2002, criminal suspects in Baiyin city of Gansu province and Inner Mongolia baotou continuous raping killing 11 women, known as "unsolved case of the century". On August 26 this year, with the arrest of 52 high, silver "8·05" series of rape murder solved.
"The late 80 early 90, case number is property, passion and revenge. For the time being, serial murders in the homicide case also is relatively low. "Silver City Public Security Bureau introduced team captain Liu Tonglin, Chinese public security authorities mobilized police, within the original scope of the crime in the first case all males aged 15 to 30 years, and" 94·7 ? 27 "original to Silver City incident a case power supply Bureau in living areas, all male, silver has a criminal record, rogue misdeeds thoroughly review each of the officers, have made no substantive progress.
In 1998, the suspects committing insane degree to the extreme. Gansu Provincial Department of public security coordination specialists, describe the suspects ' physical characteristics. Project based on the modus operandi and fingerprint comparison, using six case detection.
"Within the scope of all identified men born from 1957 to 1975 ' exhaust ' all over again. "Silver City Public Security Bureau said Yang Li, Deputy Director of the Department, all the police have to troubleshoot task," young "had been checked several times.
Liu Tonglin introduced several crime has the characteristic of public toilets, project analysis, criminal suspects may commit the crime in public before hiding places "dot" on the six cottage areas, public toilets on site distribution mapping, sent police from a squat.
August 2001, China Ministry of public security will the case set for Department du case, in yihou of years in the, times sent forensic and the forensic experts and Gansu Province Police Office Interpol Corps members composition experts group on case for consultation, expanded extension troubleshooting regional, on Baiyin city three County two district, and multiple system units and the Lanzhou city yuzhong, and gaolan two County, meet age paragraph of male carried out new a round project troubleshooting.
From case to case cracked in 28 years, fingerprints only public security organs around the case amounted to 230,000, the investment of manpower and material resources cannot be quantified.
Secrets 2
17 cases attached silver case
From 1998 to 2015, Silver series Gansu rape homicide "link" method, where a case was irrelevant to consider with silver. "All made the case, within the scope of suspicious, including wrongful death, almost all checked. "The Guangdong Provincial Public Security Department said Hu Yi, the Secretary of Gansu province.
However, the suspects disappeared, the case in trouble again and again. Police in Gansu and silver, the case became "century cold case", for several reasons.
There is evidence of a crime, there is no search for leads. "Long time investigation of the case is not broken, mainly due to the crime evidence very well, almost no clues to identify and expose the suspect. "Liu Tonglin said, the suspects left fingerprints at the scene, footprints, sperm a lot, but no clues pointing to who. Murder suspects and victims will be more or less certain, but in this case, the suspect and victims are not related.
Nomadic, elusive. Daytime crime, crime in Baiyin area, which reflects the characteristics of local crime. In Baiyin city, the police were consistent with ages full coverage after fruitless investigations of the crime, will be further expanded to adjacent ' sdevelopment in the city of Lanzhou, gaolan County. But suspects have been unsettling, in addition to outside the blue short lived in the town house, track their whereabouts in Gansu province, Lanzhou, Tianshui and Bayan Nur, baotou city, Inner Mongolia and other places. "Silver screening, he Qingcheng, Qingcheng into the scope of investigation, he went to Lanzhou, Inner Mongolia. "Liu Tonglin said.
Suspect overcautious, committed no other cases. 28 years, Gansu province occurred in the case of 14 years and case cracked before all criminal suspects to gather fingerprints and DNA, if criminal suspects in the series of cases other cases once, immediately into the police view. But cases of criminal suspects in the series of cautious, avoiding contact with people, not to make offences requiring the police to intervene.
All these "coincidences", leading suspects several times with police investigation "pass".
Secret 3
Offenders DNA storage
Last year, the adjustment of China's public security departments in Gansu province cracked, use new technology tools, tightly around the scene of two breakthrough DNA and fingerprint detection crucial. Strengthening construction of criminal investigation DNA database for all offenders collected blood samples and fingerprints, and DNA library entry after a laboratory analysis.
Areas of DNA in criminal investigations is called "biological fingerprint" DNA-Y technology through the patrilineal kinship shooting suspects. Late last year, along with the DNA library construction and collecting work, suspect a relative were collected blood samples for crime. Baiyin City Public Security Bureau for further investigation will be 4 relatives of suspects into the scope of DNA collection.
On August 18, the Gansu Provincial Public Security Bureau decided to over 230,000 collects fingerprints, 10yuwanfen blood samples from all test storage, using DNA-Y technology, the suspect DNA family investigation, further narrowing the scope of investigation.
On August 19, the technicians in the chromosomes of DNA-Y the collected blood samples for testing, series case suspect DNA27 y silver in Baiyin city in the loci of all offenders high. In other words, they are "family".
High xxx trial was informed that the high home in Qing Cheng, yuzhong County in Lanzhou, the family's current membership of more than 100,000 people, distributed all over China.
Group immediately split three-way investigation. High members that live in a school canteen in silver, a team of police immediately. When surveyed, high a flustered, the police then found his fingerprints and suspects left fingerprints similarity.
Trial, the high caste members account from 1988 to 2002, has elements of silver, baotou sexual assault crimes of killing 11 women. Further identification of fingerprints and DNA, fingerprints and series in the murder case of rape suspects left the scene for fingerprints and DNA are all the same.
At this point, the silver "8·05" serial rape murder solved.
(Editors: Biao Guo UN832)
2016-11-25 04:34:22
The Beijing News
警方解释白银杀人案侦破：DNA入库比对找出嫌犯
警方曾经公布的嫌犯画像。
甘肃省公安厅24日通报了白银“8·05”系列强奸杀人案侦破情况。记者从甘肃警方了解到，28年来，为侦破这起“世纪悬案”，采集指纹达23万枚。2015年以来，甘肃省中国公安部门紧抓指纹和DNA两大证据不放，在全省开展DNA基因库建设，实现违法犯罪人员全录入，为侦破该案提供了关键的基础条件。
揭秘1
绘制公厕地图全天蹲守
1988年至2002年，犯罪嫌疑人在甘肃白银市及内蒙古包头市连续强奸残杀女性11人，被称为“世纪悬案”。今年8月26日，随着52岁高某的落网，白银“8·05”系列强奸杀人案告破。
“上世纪80年代末90年代初，命案多是侵财、情杀和仇杀。就目前来说，连环凶杀在命案中也占比较低。”白银市公安局刑警支队支队长刘同林介绍，中国公安部门调集警力，对首案案发地原始范围内所有15岁至30岁男性，以及“94·7·27”案件案发地白银市供电局原始生活区域内所有男性，白银区有前科、流氓劣迹的人员逐一进行了摸底审查，均未取得实质性进展。
1998年，犯罪嫌疑人作案疯狂程度达到极致。甘肃省公安厅协调专家会诊，刻画嫌疑人体貌特征。专案组依据作案手段和指纹比对，将六案并案进行侦查。
“1957年至1975年出生的所有确定范围内男性几乎‘排’了一遍。”白银市公安局政治部副主任杨丽说，所有民警都有排查任务，“小年轻”都被查了若干次。
刘同林介绍，针对几起案发地都有公厕的特点，专案组分析，犯罪嫌疑人可能在作案前以公厕为藏身地“踩点”，对六案现场平房区的公厕分布绘制成图，派警力全天候蹲守。
2001年8月，中国公安部将该案定为部督案件，在以后的几年中，多次派出刑侦及法医专家与甘肃省公安厅刑警总队成员组成专家组对案件进行会诊，扩大外延排查区域，对白银市三县两区、多个系统单位及兰州市榆中、皋兰两县等符合年龄段的男性开展新一轮专案排查。
从首案案发至案件告破的28年间，公安机关围绕案件仅采集指纹就达23万枚，投入的警力和物力无法统计。
揭秘2
17年案件均挂靠白银案
1998年到2015年，甘肃对白银系列强奸杀人案采取“案案挂靠”的方法，凡有案子，先考虑跟白银案有无关系。“所有犯了案的、可疑范围内的、包括非正常死亡的几乎全查过了。”甘肃省公安厅刑侦局局长胡义说。
尽管如此，犯罪嫌疑人就像凭空消失一样，案件一次次陷入困境。甘肃及白银警方介绍，该案成为“世纪悬案”，有几方面原因。
有犯罪证据，没有追寻线索。“案件久侦不破，主要原因是认定犯罪的证据非常充分，认定和揭露犯罪嫌疑人的线索几乎没有。”刘同林说，犯罪嫌疑人在现场留下的指纹、脚印、精斑很多，但没有线索来指向这些是谁的。一般命案的犯罪嫌疑人和被害人或多或少会有一定的关系，但本案中，犯罪嫌疑人和被害人完全没有关系。
居无定所，行踪不定。均为白天作案，案发都在白银市区，这些特征都反映出当地人作案的特点。在警方对白银市当时符合作案年龄段人群全覆盖调查无果后，将范围进一步扩大至毗邻的兰州市榆中、皋兰两县。但犯罪嫌疑人一直居无定所，除了在青城镇家中短期居住外，行动轨迹飘忽于甘肃兰州、天水及内蒙古巴彦淖尔、包头等地。“在白银排查时他在青城，将青城纳入排查范围了，他又到了兰州、内蒙古。”刘同林说。
犯罪嫌疑人谨小慎微，没有犯过其他案件。28年里，甘肃对此案发生的14年中及案件告破前所有犯案的嫌疑人采了指纹和DNA，如果犯罪嫌疑人在系列案件之外一旦犯过其他案件，立即就会进入警方视线。但犯罪嫌疑人在系列案件之外谨小慎微，避免与人接触，更没有做出需警方介入的违法行为。
以上种种“巧合”，导致犯罪嫌疑人多次与警方的侦查“擦肩而过”。
揭秘3
违法犯罪人员DNA入库
去年起，甘肃中国公安部门调整侦破思路，利用新的技术手段，紧紧围绕现场遗留的DNA和指纹两个突破口开展破案攻坚。同时加强刑事侦查DNA库建设，对所有违法犯罪人员采集血样和指纹，并在化验分析后录入DNA库。
DNA在刑侦领域被称为“生物指纹”，DNA-Y技术能通过父系亲缘关系排查犯罪嫌疑人。去年下半年，随着DNA库建设和血样采集工作推进，犯罪嫌疑人一名亲属因违法犯罪被采集到血样。白银市公安局进一步排查工作将犯罪嫌疑人4名亲属纳入DNA采集范围。
今年8月18日，甘肃省公安厅决定对历年采集的23万枚指纹、10余万份血样全部重新检测入库，利用DNA-Y技术，对犯罪嫌疑人DNA进行家系排查，进一步缩小侦查范围。
8月19日，技术人员在对采集到的血样进行DNA-Y染色体进行检验时，系列案件犯罪嫌疑人的DNA27个Y基因座全部比中白银市白银区违法犯罪人员高某某。也就是说，这俩人是“一家子”。
经对高某某审讯得知，其所在的高家位于兰州榆中县青城镇，该家族现有成员超10万人，分布中国各地。
专案组立即兵分三路排查。得知有位高系成员居住在白银一学校的小卖部里，一队民警立即前往。入户调查时，高某神色慌张，民警随后发现其指纹和嫌疑人现场遗留指纹高度相似。
经审讯，该高姓成员全部交代了自1988年至2002年先后流窜白银、包头性侵杀害11名女性的犯罪事实。经进一步指纹和DNA鉴定，其指纹和系列强奸杀人案中嫌疑人遗留现场的指纹、DNA全部比中同一。
至此，白银“8·05”系列强奸杀人案成功告破。
(责任编辑：郭彪 UN832)
2016-11-25 04:34:22
新京报