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There is a detectable bias in drug-sniffing dogs based on handler beliefs
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SUPPORTED
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refutedsupported
the weight of evidence
3 sources for · 0 against
AS REPORTEDno primary record reached; this is what the reporting says

Published studies and reports show that scent and drug-sniffing dogs are influenced by handler beliefs, resulting in increased false alerts when handlers expect to find a target scent.

Evidence for · 3
Handler beliefs affect scent detection dog outcomes | Animal Cognition | Springer Nature Link
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Handler beliefs affect scent detection dog outcomes | Animal Cognition | Springer Nature Link # Handler beliefs affect scent detection dog outcomes - Original Paper - Open access - Published: 12 January 2011 - Volume 14, pages 387–394 (2011) - Cite this article You have full access to this open access article ## Abstract Our aim was to evaluate how human beliefs affect working dog outcomes in an applied environment. We asked whether beliefs of scent detection dog handlers affect team performance and evaluated relative importance of human versus dog influences on handlers’ beliefs. Eighteen drug and/or explosive detection dog/handler teams each completed two sets of four brief search scenarios (conditions). Handlers were falsely told that two conditions contained a paper marking scent location (human influence). Two conditions contained decoy scents (food/toy) to encourage dog interest in a false location (dog influence). Conditions were (1) control; (2) paper marker; (3) decoy scent; and (4) paper marker at decoy scent. No conditions contained drug or explosive scent; any alerting response was incorrect. A repeated measures analysis of variance was used with search condition
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rails:sufficiency:supported:for=3+0p:against=0+0p | v55:sufficiency

More for · 2
Frontiers | Effect of Handler Knowledge of the Detection Task on Canine Search Behavior and Performance
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Frontiers | Effect of Handler Knowledge of the Detection Task on Canine Search Behavior and Performance #### Veterinary Humanities and Social Sciences Published inFrontiers in Veterinary Science 3.1 impact factor5.3 citescore Part of a Research TopicWorking Dogs: Form and Function, Volume II563k views21 articles ## ORIGINAL RESEARCH article Front. Vet. Sci., 27 May 2020 Sec. Veterinary Humanities and Social Sciences Volume 7 - 2020 | https://doi.org/10.3389/fvets.2020.00250 # Effect of Handler Knowledge of the Detection Task on Canine Search Behavior and Performance CF Cameron Ford 2 - MTMallory T. DeChant 1* - NJNathaniel J. Hall 1 1. Department of Animal and Food Sciences, Texas Tech University, Lubbock, TX, United States 2. Ford K9, Las Vegas, NV, United States Article metrics View details ## Abstract Detection dogs are commonly trained and tested under conditions in which the handler or the evaluator knows the true presence or absence of a target odor. Previous research has demonstrated that when handlers are deceived and led to believe that a target odor is present, more false alerts occur. However, many detection teams operate under unknown conditions, and it
Handler beliefs affect scent detection dog outcomes - PMC - NIH
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Handler beliefs affect scent detection dog outcomes - PMC Anim Cogn . 2011 Jan 12;14(3):387–394. doi: 10.1007/s10071-010-0373-2 # Handler beliefs affect scent detection dog outcomes 1,4,✉, Julie B Schweitzer 2, Anita M Oberbauer 3 - Author information - Article notes - Copyright and License information 1Department of Neurology, University of California at Davis, Sacramento, CA 95817 USA 2Department of Psychiatry and Behavioral Science, University of California at Davis, Sacramento, CA 95817 USA 3Department of Animal Science, University of California at Davis, Davis, CA 95616 USA 4M.I.N.D. Institute, University of California at Davis, 2805 50th Street, Room 2415, Sacramento, CA 95817 USA ✉ Corresponding author. Received 2010 Mar 30; Revised 2010 Dec 13; Accepted 2010 Dec 14; Issue date 2011. © The Author(s) 2011 This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. PMC Copyright notice PMCID: PMC3078300 PMID: 21225441 ## Abstract Our aim was to evaluate how human beliefs affect
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  1. Handler beliefs affect scent detection dog outcomes | Animal Cognition | Springer Nature Linkreferenceno side taken
  2. Frontiers | Effect of Handler Knowledge of the Detection Task on Canine Search Behavior and Performancereferenceno side taken
  3. Handler beliefs affect scent detection dog outcomes - PMC - NIHreferenceno side taken
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first checked05 Aug 2026
judged → INSUFFICIENT EVIDENCE · 005 Aug 2026
held for human review12 Aug 2026
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