How to collect DNA samples at the crime scene?

AusBiotech says changes to research tax incentives would force valuable medical research offshore. (AAP) Source: SBS
On April 10th, Chinese actor Gao Yunxiang was involved in a court hearing in Sydneys local court. However, the final bail application was rejected. According to ABC reports, the police collected evidence of a piece of tissue covered with semen on the spot. Interview Criminologist Mr Ray He, to talk about how to collect and keep DNA samples at the crime scene.
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