Cui Daozhi

Cui Daozhi (; ; born June 1934) is a Chinese forensic scientist renowned for his expertise in trace evidence and ballistic identification. Recognized as one of China's first specially invited criminal investigation experts by the Ministry of Public Security, Cui is celebrated as China's foremost expert in firearm and ballistic trace identification. Over his 60-year career in criminal investigation, he handled over 1200 major cases, conducting more than 7000 trace evidence analyses.

Early life Cui Daozhi was born in June 1934 in Hailong County, then part of Fengtian Province under the Japanese puppet state of Manchukuo (now Meihekou in Jilin, China), to a tenant farmer family of Korean ethnicity. He lost his father at age four and his mother at age six, after which he and his elder sister were raised by their grandfather. Following the Soviet invasion of Manchuria in 1945, he began attending school with government support and later became the leader of a children's group. During the Korean War in 1951, he enlisted in the Chinese People's Volunteer Army, serving in a translation training unit. On 6 December 1953, he joined the Chinese Communist Party. His performance led to his promotion to platoon leader in 1955.

Career

In 1955, Cui transitioned from the military to the Heilongjiang Provincial Public Security Department. From 1957 to 1959, he studied trace evidence analysis at the First People's Police Cadre School of the Ministry of Public Security (now Criminal Investigation Police University of China), becoming one of China's first students in this field and Heilongjiang's sole criminal investigation technician at the time. During his studies, he received the "Advanced Technical Revolutionary" award. He later pursued further education at Harbin Amateur Workers' University and Harbin Medical University to enhance his criminal investigation knowledge. After the Cultural Revolution, he was promoted to head of the Trace Evidence Section.

In the early 1970s and 1981, in an era without DNA technology, Cui solved two homicide cases in Harbin and Mudanjiang by analyzing bite marks on a victim's face and fingernail fragments left in a victim's abdomen, pioneering the use of bite marks and fingernails for identification in complex cases. In 1975, he collaborated with researchers from four provinces on a four-year study titled The Relationship Between Hand Dimensions, Height, Age, and Body Type . Starting in 1981, he authored several influential papers regarding ballistic trace identification which were published in Ministry of Public Security textbooks and presented at the 10th Interpol Conference in 2024.

Despite his retirement in 1994, he was rehired between 1996 and 1997, he analyzed ballistic evidence in a series of armed assaults and robberies in Xinjiang and Beijing, designated as China's "No. 1 Criminal Investigation Case" of 1997 and the third most significant case globally by Interpol. His analysis confirmed that bullets and casings from both locations were fired from the same Type 81 rifle, identifying the suspect as an individual transferred from Beijing to serve a sentence in Xinjiang. Within a week, his findings led to the arrest of the perpetrator Bai Baoshan. In September 1999, Cui was appointed one of the Ministry of Public Security's first specially invited criminal investigation experts. His honors and titles include: National Public Security Science and Technology Outstanding Contribution Award (2006) The Most Beautiful Struggler (2019) July 1 Medal (2021)

In popular culture In the 2024 TV series , the trace examination expert character in the series, Cao Zhongshu, is based on Cui.