The use of forensic evidence to prove guilt needs a reasoning process to turn forensic conclusion of evidence source into inference of suspect activity,and the latter are used as legal fact tO prove the suspect guilt or noL These processes can be described by a hierarchical model of forensic evidence,which consists of a source level,an activity level and offence level The notion of a hierarchy model is very helpful for structuring and understanding the issues of forensic use in the judicial setting.
stained with haematoxylin were captured by 1aser and infrared using VeritasTM LCM system,the DNA was extracted by improved silicon methods,then was amplified in 5“L volume with identifilerTM kits.Results Above 13 STR lOci genotype were obtained from 20 oral epithelia.Conclusion The methods established in this paper were suitable for DNA testing on the stained slides of biologieal samples.