Crime Scene 11.1
Measures the officer can take to minimize contamination at crime scene
wearing proper PPE, do not touch face, hair, cell phone, etc., change gloves often between samples
do not talk over evidence as your DNA could be transferred
sterilize all reusable equipment
Recognize the difference between class and individual evidence characteristics
Class characteristics: traits or characteristics of evidence that allow the item to be compared with a group
-shared by all members of its class
-cannot be identified to a single source
Individual characteristics: traits or characteristics of an item of evidence that allows the item to be compared with a specific object or person
-comparison will determine whether or not the item originated from the object or person (i.e., cuts, scratches, wear pattern)
Describe the primary responsibilities of the first responder to a crime scene (Rendering aid)
-document any aid given to individuals and if items/evidence was moved
-limit medical response entering scene
-officer should be assigned to go to the hospital with the victim if he/she is transported... obtain a consent to search, secure victim's clothing, witness a dying declaration
-a LE officer cannot pronounce a person dead
Describe chain of custody
Labeling evidence (tags should never be removed, directly attached to evidence packaging)
Factors to show integrity of evidence in the chain of custody (evidence collected at crime scene is the same as presented in court, not be altered or changed)
Describe the primary responsibilities of the first responder to a crime scene (Securing the scene)
-establish a perimeter farther out than you think is necessary
-perimeter should also include entry and escape paths used by suspects
-inner perimeter (will need a crime scene log)/outer perimeter
-can be as simple as removing all individuals from a scene and closing a door
Primary responsibilities of the first responder to a crime scene (officer safety)
-offender is a crime scene himself/herself
-consider other threats to your safety
-if a weapon is present, you do not need to unload and secure it immediately unless there is a potential risk
- may have to conduct a protective sweep of the scene to ensure offender is not present
Describe the primary responsibilities of the first responder to a crime scene (Interacting with witnesses)
-restrict movement of witnesses to prevent contamination or destruction of evidence
-separate witnesses so that information is not shared
-examine and photograph clothing of witnesses if needed