GUNSHOT RESIDUE (STUB SUBSTRATE)
The FTS Gun Residue proficiency test is designed to challenge the forensic examiner who may be asked to identify particles of gunshot residue by scanning electron microscopy techniques. Test samples are distributed on pin-type aluminum SEM stubs with carbon adhesive tabs. Positive and negative GSR samples are screened prior to distribution. This screening may be subcontracted to a ISO 17025 accredited laboratory and FTS is responsible for their work.