SEM, or Scanning Electron Microscopy GSR tests, are conducted through analysis of the residues which have been collected on sticky metal stubs.

AA, or Atomic Absorption GSR tests, are conducted by analysis of the residues which have been collected on cotton-tipped swabs.

Check with an authorized forensic laboratory to see what type of analysis may be performed. These kits contain the necessary materials for collecting Gunshot Residues from an individual. Packaged in paper envelopes.