犯罪现场调查洛卡德原则——“每次接触都会留下痕迹”——这就是痕迹物证的由来。在一个犯罪现场,罪犯会留下痕迹,他们也会在不知情的情况下带走一些证明他们在现场出现过的证据。微小的颗粒,比如说毛发、衣物纤维、油漆或者土壤,这些都可以让警察将一个嫌疑人和现场联系起来,甚至可以因此将一个罪犯绳之以法。 Locarno investigation of the crime scene principle - “every trace will be left behind ” - this is the origin of traces of evidence. At a crime scene, criminals will leave traces and they will also take some evidence of their presence on the spot without their knowledge. Tiny particles, such as hair, clothing fibers, paint or soil, can all allow police to connect a suspect to the scene and can even bring a perpetrator to justice.