Gunshot Residue (Distance Determination)


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Standard (Static) Proficiency Test Design: $200

Declared Double Blind Proficiency Test Design: $250


Description: Participants are requested to visually examine and chemically process unknown gunshot residue patterns.  Their results are to be compared to high resolution printed images of unprocessed and chemically processed (Modified Griess Test and Sodium Rhodizonate Test) known distance gunshot residue patterns.  The participants will be tested on their ability to properly process and evaluate gunshot residue patterns to determine a muzzle-to-target distance range.

2018 Gunshot Residue Proficiency Test
Distribution: week of May 7, 2018
Answer Submission Deadline: August 6, 2018

2019 Gunshot Residue Analysis Proficiency Test
Purchase Deadline: November 2, 2018
Distribution: week of May 6, 2019
Answer Submission Deadline: August 5, 2019 

Standard Proficiency Test Design: Each forensic practitioner will receive the same test samples as others in their laboratory, with the correct answers being the same. The test will be comprised of some of the same proficiency testing items used in the declared double blind test design, and the samples that are used will be different for every testing cycle. The static proficiency tests will have the same purchase deadlines, distribution dates and answer submission deadlines as the declared double blind test designs.

Declared Double Blind Test Design: Each forensic practitioner will receive a test composed of randomly selected unknown and/or known proficiency testing items, with the correct answers being specific to each test.  Participants will be unable to gain information regarding the answers to their test through discussions with others participating in the same testing cycle, or with those administering the test.  These blind elements are incorporated into the design of our tests to reduce the effects of bias on testing results. Forensic Assurance proficiency tests are declared (the participant knows that they are taking a test).