Evidence 1 - Blood on RockEvidence 2 - Gun In Victims HandEvidence 3 - Aluminum Can 1How would you collect the blood on the rock from start to finish? 2How would you collect the gun in the victims hand from start to finish? 3How would you collect the aluminum can from start to finish?
First the entire scene must be securedNext you photograph and document the entire sceneThis may require using a computerized transit that gives positions, elevations, evidence points, etcProper clean protective body suit, shoe covers and glovesGloves must be changed often to prevent cross contaminationBlood on rock- If possible you take the entire rock with the blood on itIf not you can liquefy a dry blood area with a sterile cotton patch and sterile distilled waterThoroughly soak the patch and allow it to dry thoroughlyProperly package the patches separately in paper, not plasticA dry patch will keep DNA a long timeIf wet or packed in plastic the humidity or dampness will cause almost immediate degradation of the samplegun- first you must make sure the weapon is safe by making sure it is unloadedTry not to disturb any fingerprints, but safety is paramountPlace in an unused cardboard box or strong paperCover the victim's hands with paper bags so no evidence is lost during transportcan- place in a clean paper bag or boxAll evidence must be properly labeled to show what it is, when and who collected itAn unbroken chain of evidence is importantOne break in this chain can cause all related evidence to be unusable in courtGo to the FBI website and you can download their Handbook of Forensics which gives all the finer details of processing a crime scene.
