Affiliation: | 1. Department of Document Examination, Criminal International Police University of China, No. 83 Tawan Str., Shenyang City, 110854 China;2. Department of Document Examination, Criminal International Police University of China, No. 83 Tawan Str., Shenyang City, 110854 ChinaCorresponding author: Biao Li, M.Sc. E‐mail:;3. Guangzhou Public Security Bureau of China, No. 83 Zhanyizhi Str., Guangzhou City, 510000 China;4. Shanghai Key Laboratory of Crime Scene Evidence, No. 803 Zhongshan North Road, Shanghai City, 200083 China |