AFTE Store - A Comparison of Several Substrates Used for Gunpowder Stippling Evaluations

When gunshots are directed toward exposed skin at muzzle to target distances no greater than a few feet, there is a high probability that partially burned and unburned gunpowder particles will strike the skin. When this happens, the resultant lesions are known as gunpowder stippling or powder tattooing. If the muzzle to target distance is small enough, soot (smoke) deposits may also be observed on the skin about the entry wound. By carrying out test firings into a suitable substrate, the examiner can establish a probable range of fire based upon reproducing similar soot deposits and stippling patterns. Many crime laboratories carry out the test firings and then turn their results over to forensic pathologists who then testify as to the interpretation of those results. Over the years, a number of different substrates have been utilized for this testing. This study was undertaken for the purpose of comparing the results obtained for several substrates used in powder stippling evaluations and to determine whether there are any obvious advantages/disadvantages associated with any of them.

Full Journal: AFTE Journal Vol 43 No 1 (2011)