False-Positive and False-Negative Error Rates in Cartridge Case Comparisons

In this webinar, we will present the results and discuss the implications of an error rate study of cartridge case comparisons.  The study was designed to measure false positive and false negative error rates of examiner comparisons of fired cartridge cases.  The study included a determination of the rate for poor mark reproduction.  It also was designed to provide uncertainties for these rates.  The statistical treatment used and meaning of the measured rates will be discussed.  The results show a significant variation in how the AFTE range of conclusions is implemented.