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PhysicalEvidenceAnymaterialeitheringrossortracequantitiesthatcanestablishthroughscientificexaminationandanalysisthatacrimehasbeencommitted.ClassificationofPhysicalEvidenceAnothercommonlyusedclassificationofphysicalevidencePhysicalevidenceutilizationinotherareasofforensicinvestigationProvidesinvestigativeleadsforacaseTiesonecrimetoasimilarcrimeorconnectsonesuspectwithanotherCorroboratesstatementsfromwitnessestoorvictimsofacrimeTheelementsofacrimehelptodeterminewhatwillbeusefulasevidence.Besidesknowingwhattypesofevidencetosearchfor,itisnecessarytoknowwhereevidenceismostlikelytobefound.CharacteristicsofevidenceTypesofphysicalevidenceTypesofphysicalevidenceTypesofphysicalevidenceTypesofphysicalevidenceTypesofphysicalevidenceTypesofphysicalevidence法医物证检材的提取、包装、送检一、法医物证检材的概念二、法医物证检材的特点三、检材的提取、保存与送检3.1检材的发现3.2检材提取的一般原则3.2检材提取的一般原则(续)3.2.1血液及血痕的提取3.2.1血液及血痕的提取(续)3.2.1血液及血痕的提取(续)3.2.2精斑的提取3.2.3唾液斑提取3.2.3唾液斑提取(续)3.2.4毛发的提取3.2.5粪便的提取3.3检材的送检3.4检材的保存3.4检验程序及要求