How have police officers testified during trial on subjects based on their training and experience?

California, United States of America

The following excerpt is from People v. Lozano, A130107 (Cal. App. 2013):

Several police officers testified during trial, in part, on subjects based upon their training and experience. Without objection, they offered opinion testimony on the inherent risks in traffic stops, and the likelihood that trained canines would discover personal items discarded by a defendant in the vicinity of a crime scene. The efficacy of search dogs is a proper subject of expert testimony. (People v. Willis (2004) 115

Page 8

Cal.App.4th 379, 386.) The court was correct to instruct on the jury's proper consideration of expert testimony.

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How have police officers testified during trial on subjects based on their training and experience?

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