1 案例 1996年6月12日下午,济宁市长途客车公司,一辆大型客车行至梁山县境内时,五名犯罪分子手持菜刀、催泪瓦斯等凶器抢劫了车上乘客钱物达四万余元。现场勘察时提取到一枚犯罪分子遗留在一名乘客的黑色密码箱上的足迹印痕。在自然光下观察,足迹印痕呈浅灰色,反差十分微 1 Case On the afternoon of June 12, 1996, when Jining’s long-distance bus company and a large passenger bus arrived in the territory of Liangshan County, five criminals robbed the passengers on the vehicle of more than 40,000 yuan with choppers, tear gas and other weapons . At the scene of the investigation, a footprints imprinted by a criminal on the black lockbox of a passenger were extracted. Observed in natural light, footprint impression light gray, contrast is very slight