AFTE Range of Conclusions
For purposes of this module, typical fired cartridge case and shotshell case comparisons fall into two broad categories:
- An evidence cartridge case or shotshell case from a crime scene is identified as having been fired in a particular evidence firearm.
- Evidence cartridge cases or shotshell cases recovered from the same or separate incidents are identified as having been fired in a single firearm (no firearm submitted).
Based on the AFTE Theory of Identification, there are four categories of examination outcomes (Range of Conclusions Possible When Comparing Toolmarks) typically used by firearm examiners in the microscopic comparison of fired cartridge cases and shotshell cases.
These categories are accepted for all types of toolmark comparisons:
- Unsuitable for comparison