目的 探讨靶向生物痕迹发现仪在公安实战中的应用价值。方法 在一起抢劫案现场提取的砖头上喷洒显影试剂,暗室环境下激光照射,经滤光发现荧光斑迹后,用植绒拭子提取,随后进行DNA检验,验证提取斑迹位置是否准确。结果 靶向生物痕迹发现仪准确显示了嫌疑人在砖头上的触摸部位,DNA检验证实,两处荧光斑迹处擦拭物均检出单一有效STR分型,成功比中DNA数据库中的犯罪嫌疑人。结论 靶向生物痕迹发现仪对发现、提取接触类检材如石头、砖块等载体上的触摸痕迹物证有较高的导引性,对法医DNA检验鉴定有应用价值。

-- Objective-- To explore the value of biological evidence-targeting device for public security to combat against crimes.Methods Onto a brick seized from a robbery case, the developing reagent was sprayed and irradiated with laser so that the fluorescence-emitting spots were observed through glasses-wearing eyes in dark room. From the fluorescent spots, the forensic flocking swab was used to extract the potential biological evidential materials that were afterwards undergone into DNA test for verification of the evidence location.Results The biological evidence-targeting device did expose the accurate positions where the crime suspect touched the brick because a same single and valuable STR-genotype had been successfully detected from the fluorescence-emitting spots (the touch sites), with the suspect having successfully been matched in DNA database. --Conclusion-- Biological evidence-targeting device is valuable to find the “touch” forensic evidence from biological materials on the carriers (e.g., stones and bricks), showing indicative of orientation for forensic DNA examination and identification.