A recent Canadian case has highlighted an apparent issue that is affecting how some courts are assessing the probative value and admissibility of expert image comparison evidence. This article reviews…
Best Practices for Obtaining Video Evidence from DVRs, Smartphones, and Other Devices
In an ideal world, the people who recover video evidence from devices for legal purposes would be fully conversant with how to perform this task in a forensically sound manner…
State Supreme Court Adopts Forensic Image Comparison Opinion: Issues Raised by the Evidence
Forensic image comparison, wherein questioned images are compared to known images to determine similarities and differences in image content, has been the subject of judicial commentary in courts in Canada,…
Reverse Projection Photogrammetry: When is Measurement Uncertainty an Issue of Admissibility?
A home security video surveillance system captured relevant events that transpired outside the home before and after two murders were committed nearby. Of note, it recorded images of a person…
Police Record CCTV Monitor – Authentic Enough?
There are occasions when investigators are unable to export an original video recording from the DVR and therefore use a video camera to record the CCTV monitor as it plays…
Who is Qualified to Express an Opinion on Image Comparison?
A fundamental question in the forensic process of image comparison is what qualifies a proposed expert to express such an opinion for the court’s consideration. Various contenders ranging from people…
State Supreme Court Rules on Admissibility of Expert Motion Tracking Evidence
In dynamic video-recorded scenes where several people move around within the frame and from camera to camera it can be difficult to accurately track the movement of individuals. This makes…
Canadian Court Restricts Evidence of Forensic Video Analyst in Murder Trial
In preparation for a Canadian homicide prosecution, a forensic video analyst performed several technical and analytical processes on video images that captured relevant events. The defence objected to most of…
Image Technology and Visual Literacy Issues in the Rittenhouse Trial
The November 2021 trial in State of Wisconsin v. Rittenhouse garnered significant media attention across the United States, in part because of its rather sensational facts, and in part because…
Case Study: Social Media Video Ruled Inadmissible
Social media sites have provided both benefits and challenges to investigators, counsel, and the court. The benefits they can provide are manifold. The amount of communication that is conducted through…
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