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NIJ Training Course for Firearm Examiners: Chemical Testing Technique Using the Modified Griess Method

An interactive tool used to supplement the NIJ online training course entitled 'Firearm Examiner Training', as outlined in the twelfth learning module, 'Toolmark Identification'. This brief demonstration shows an example of the Modified Griess Test by placing test paper over the evidence and is treated with a mixture of distilled water and alcohol samples.  

Date Published: June 23, 2020