Case (cite)
Williams v. State, 2017 WL 4946865 (Tex. Crim. App. 2017)
on error rate: “[the expert] acknowledged that a precise casework error rate could not be measured. But he pointed out that consecutive-manufacture and proficiency studies provided error rates in the context of controlled studies. Those known error rates could then be used to estimate casework error rate.”
on the subjectivity of firearms examination: “[the] implementation of professional standards and protocols, periodic lab audits and proficiency testing, and the independent review of the comparisons in each case by a second examiner, helped counteract the subsjective elements of an examiner’s conclusions.”