1、Tool mark Impressions工具痕迹 Tool mark impressions can usually be found at the point of entry. Tool marks are unique and can be individualized.工具痕迹往往在现场入口处，它是唯一的，并具有个性化特征。KNOWN已知CASTING拓模所得If a tool mark is located it should be photographed with and without a scale. The impression should be cast with a
2、 silicone based casting material such as Mikrosil. After casting the cast should be affixed to a card with identifying information and submitted to the lab.定位好了工具痕迹，就可以使用比例标尺牌照固定。这类工具痕迹可以使用硅胶拓模，把痕迹模型与鉴别卡片相匹配送往犯罪实验室进行甄别。Casting the tool mark impression is the same as casting a fingerprint. Suspect tools should be submitted to the lab for comparison. Impression Evidence Practical Exercises模拟画像确定犯罪嫌疑人
