Statistical methods for bullet matching

dc.contributor.advisor Heike Hofmann
dc.contributor.advisor Kris De Brabanter
dc.contributor.author Hare, Eric
dc.contributor.department Statistics
dc.date 2018-08-11T10:42:34.000
dc.date.accessioned 2020-06-30T03:03:00Z
dc.date.available 2020-06-30T03:03:00Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2017
dc.date.embargo 2001-01-01
dc.date.issued 2017-01-01
dc.description.abstract <p>Despite being an accepted and established forensic science practice, the process of matching bullets to determine whether they were fired from the same gun barrel has come under fairly intense scrutiny in recent years. This began in earnest in 2009 with a National Academy of Sciences report questioning the scientific validity of these methods. Further criticisms were made in a 2016 report by the President's Council of Advisors on Science and Technology (PCAST). After PCAST determined that there has only been one appropriately designed study to assess the accuracy of bullet matching methods, the report concluded that "[T]he current evidence falls short of the scientific criteria for foundational validity." The report also outlines a way forward by noting "A second—and more important—direction is . . . to convert firearms analysis from a subjective method to an objective method." This thesis attempts to take steps towards that goal. It begins by describing an automatic algorithm for matching bullet lands, and assesses this algorithm on the James Hamby study data. These ideas are then generalized in order to increase the prediction accuracy, determine operator effects in bullet scanning, handle the case of bullet land degradation, and apply to full bullet matches. Finally, a modern web-based database and software system for bullet matching is introduced, allowing for more seamless collaboration in the research community for assessing and improving these algorithms.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/15315/
dc.identifier.articleid 6322
dc.identifier.contextkey 11051155
dc.identifier.doi https://doi.org/10.31274/etd-180810-4943
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/15315
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/29498
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/15315/Hare_iastate_0097E_16330.pdf|||Fri Jan 14 20:39:16 UTC 2022
dc.subject.disciplines Computer Sciences
dc.subject.disciplines Statistics and Probability
dc.subject.keywords bullet
dc.subject.keywords hamby
dc.subject.keywords matching
dc.subject.keywords striation
dc.subject.keywords x3p
dc.title Statistical methods for bullet matching
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 264904d9-9e66-4169-8e11-034e537ddbca
thesis.degree.discipline Statistics; Computer Science
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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