In addition to the "traditional" types of evidence (murder weapon, dead body, fingerprints, etc.), police at the scene of a crime cannot afford to overlook footprints, shoe prints, tire marks, blood stains, saliva, semen, ear wax, hair, or trace evidence (such as dust and pollen).
而放眼刑案現場，不管是凶器、屍體、指紋等「一般證據」，或是腳印、鞋印、輪胎印，血跡、口水、精液、耳屎、毛髮等甚或是花粉泥土等「微物證據」，都是警察在現場偵察時不能放過的目標。