AFTE Store - Validation Study of Computer Numerical Control (CNC), Consecutively Manufactured Screwdrivers

The purpose of this study was to perform a validation study to determine if screwdrivers that are consecutively manufactured
using the computer numerical control (CNC) process can be identified by trained forensic examiners after having their class
characteristics reproduced by striated toolmark samples. The results were based on participation from seven members of the
Scientific Working Group for Firearms and Toolmarks (SWGGUN) and yielded an error rate of 0.00%. This result provides
support of toolmark identification in the scientific community, thus complying with the Daubert standard. These results
further demonstrate the CNC-consecutively manufacturing process did not eliminate the individual or class characteristics
of the screwdrivers and does not interfere with the ability of examiners to correctly associate tools and the marks they leave
on working surfaces.