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Evidence Handling Procedures (The Crime Scene (Location of Evidence…

- - - - minute and transient, but measurable
      - even without identification may still be used in circumstantial case
    - - prevent destruction and contamination
      - lab agencies coordinate to avoid interference
      - environment and improper collection, handling, and storage can degrade evidence
  - - - DNA compelling - degradation, contamination, and safety important; wear PPE
      - DNA degraded by environment
      - dry as soon as possible
    - - can contain pathogens
      - wear PPE, don't eat/put on makeup/touch face, special protection for sharps, use biohazard disposal, label containers appropriately
    - - can swab items that have been touched for DNA
  - - - Integrity
        
        generally stable
        
        keep dry to avoid molding
      - Safety
        
        BBPs, booby traps, fire, and explosions risks
- - - - firearm, ammunition, gunshot residue, etc.
      - firearm
        
        unload and safely secure
        
        direct mark as necessaryt
        
        unloaded ammunition packaged separately
      - Fired Bullets
        
        look for cartridge casings to determine minimal number of bullets
        
        handle carefully to preserve markings
      - Fired Cartridge Cases and Shot Shells
        
        mostly semiautomatic and automatic weapons
        
        mark shell appropriately
        
        package appropriately to preserve markings
        
        Unfired
        
        package same as fired; cartridges cycled through action of firearm may have marks from extractor and ejector
    - - collect objects with bullet holes or residue
      - avoid marking areas where residue is present
      - air dry blood-soaked items
    - - Tools
        
        tool - item used for mechanical advantage
        
        package tool appropriately (puncture resistant container as needed)
      - Toolmarked Items
        
        protect surfaces tool was used on (package alone)
        
        mark items that are cut out
        
        casts for large immovable objects
- - - - file/case/submission number, date received, submitting agency and file number, evidence listing and tracking data, examinations requested, examiners assigned, chain of custody, bar coding, additional examinations requested per trace evidence, estimated completion date, report dates, report contents, quality assurance information
      - customized management - case index (number of items, number of disciplines involved, number of examinations requested, number of related evidence submissions), case prioritization system, case assignment criteria (based on examiner training and experience, areas of qualification, case priority, previous submissions)
    - - assess status and progress of case, quick view of overall caseload
    - - lab note and report forms; digital imaging, video, and audio clips; prompts for additional comparisons