Crime Scene

Processing the Scene Secure and Isolate the Scene Physical Evidence – any and all objects that can establish that a crime has been committed Helps to link a victim/crime with the perpetrator Secure and Isolate the Scene First officers responsibility – Preserve life, protect scene Keep out unauthorized personal Once secured, processing can begin

Record the scene Must be done quickly to retain untouched state What are the uses for this?? Photography – unaltered!! What should be included here? Sketches – rough sketch contains proper dimensions and location of objects. Finished sketch – drafting tools (CAD) Both require training!! Notes – must be constant throughout investigation (where, who, how, when) Recorders/videos are great

Evidence Searches TYPES OF SEARCHES Methods will vary based on: Spiral Search Grid method Strip or line search Quadrant/Zone search Methods will vary based on: Size/location of scene

Items to be sent to Forensics Lab Victims clothing Fingernail scrapings Hairs Blood Swabs (various types – sex crimes, GSR) Bullets What is the time sensitivity of these objects?

Collecting/Packaging Evidence Must be done to avoid any changes from taking place to the evidence Common sense must be used when evidence is in ‘Tough’ spots (doors, large objects) **Each different item or similar items collected at different locations MUST be packaged separately to avoid cross contamination**

Chain of Custody ‘Continuity of possession’ Every person who handles the evidence MUST be accounted for Evidence must be correctly labeled with initials and time(date) Transfers of evidence must be noted ex. whomever takes it to the lab Fewer the better! (see hand out)

Obtain Controls What is the purpose of a control? Why is it so important in forensic investigations? Buccal swab – open wide!!!!

Safety Concerns at the Scene Many reforms brought on by the spread of AIDS and Hepatitis B due to OSHA regulations Gloves, Shoe covers, coveralls Mask/respirator, goggles, Be on the lookout for sharp objects Label biohazards as such Uncontaminated note taking (pens, pads,etc.) Contaminated clothing must be washed immediately – 10% bleach solution No eating/drinking/smoking or make-up