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Posts Tagged ‘How to Retrieve Evidence’

18: Creating Video Work Product as an Audio Video Forensic Expert

Friday, February 27th, 2015

18: Creating Video Work Product as an Audio Video Forensic ExpertVideo work product is a way to document forensic investigations, like evidence recovery, for reference at a later date. Processes and procedures are documented using a video camera by a forensic expert during a forensic investigation for future use. I have referred back to my video work product many times during the course of a case when I have questions later in the evolution of the case. There are a few different digital video recording platforms that I use when creating ‘video work product’. Each one of these types of systems serves a certain purpose in assisting with a forensic investigation as well as the investigative process.

I personally use the VIEVU LE2 and LE3 body worn cameras. My main use for this body camera in my investigations is recording my forensic process in the field. This includes retrieving evidence from different systems so I can review the video later and include in my report to support the authenticity of my work product and any evidence used in the case.

Another type of digital video camera that I use to produce video recordings is a HDSLR photography camera. In some investigations, a single video recorded perspective may not be sufficient to display the forensic process or document the events. Having another high quality camera with flexibility of perspectives and interchangeable lenses can capture aspects of my investigation that body worn cameras cannot.

Video evidence produced by CCTV systems can help solve crime, as well as reproduce accidents and disasters as they occurred for play back in many different settings. A significant use a video forensic expert has when recording video from a CCTV system is to create an exemplar. This recording is used as a comparison file to the original evidence to help determine the authenticity of the original evidence.

It is a best practice of ours at Primeau Forensics to video record many forensic investigations like the exemplar creation process and evidence recovery so if anyone has any questions during the life of the case, this video work product can be referenced.

Now listen in with Audio and Video Forensic Expert Ed Primeau as he discusses creating Video Work Product for Forensic Investigations.

9: How to Recover Digital Media Evidence

Friday, November 7th, 2014

9: How to Recover Digital Media EvidenceI’d like to discuss evidence recovery, specifically digital media evidence recovery.  Having a forensic expert retrieve the evidence maintains the quality of the evidence and can help ensure that the original evidence stays intact on the original system so it can later be retrieved by other parties.  This is why it is extremely important that only a trained expert retrieve the evidence.  In this episode, I will cover proper procedures for evidence retrieval, proper handling of the evidence and what precautions one should take when retrieving digital media evidence from a recording system.

Steps for Proper Evidence Retrieval

1. Research before retrieving the evidence.  The forensic expert should learn everything they can about the recording system beforehand.  Connecting with the manufacturer, reading the manual and researching further online all benefit the expert.  This will make analyzing and operating the system onsite easier for the expert and optimize the retrieval process.

2. Obtain any necessary software, proprietary player or codec. If the system records proprietary or encoded files, the expert should obtain the player or codec beforehand.  If that is not possible, the expert should be prepared to install the necessary player or codec onsite from either the recording system or client.  More often than not, modern digital surveillance systems require a special codec or proprietary player and without this installed, the forensic expert will not be able to access the digital media evidence.

3. Record the evidence retrieval process. The forensic expert should record both audio and video of the evidence retrieval to include in the chain of custody and forensic report.  When I am recovering evidence from a digital recording system, I always have a VIEVU body camera on my person, as well as a digital audio recorder in my pocket.  Along with authenticating the evidence, this can serve as the expert’s notes later on in the investigation in case they need to refer to something that was discussed during the evidence retrieval.

4. Photograph and inspect the digital recording system. The forensic expert should include photographs of the unit in their report and take careful notes on anything they notice about the unit.  This could include damage, tampering or any other abnormalities they notice on the recorder.  Along with the video recording, it is usually beneficial for the expert to photograph anything they note during the process.

5. Follow the manual for the highest quality retrieval. The expert should have the manual with them when retrieving the evidence to make sure that any copy or export is in the highest quality format and does not affect the original recorded file.
photo credit: iLike iRiver via photopin (license)

 

 

 

 

 

 

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