There is more Digital & Multimedia Evidence (DME) than any other type of evidence today.
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Those who have been recovering video evidence from CCTV systems for any length of time know that every case starts as a research project. In some cases DCCTV evidence is submitted with little or no information about the recording device. In other cases the entire device may be submitted, but more often than not it’s submitted without any manuals or documentation.
Imagine the following scenario:
You're the first responding officer to a crime scene and have just completed taking the victim's statement. You then tell the victim you have to leave for another call. Before you go you politely ask the victim to take photos of the scene and their injuries, collect all of the DNA and fingerprint evidence, and note that you'll either be back later in the day or maybe tomorrow or the next day to pick it all up. You note that they can just leave the evidence at the front desk for you.
This is exactly how many agencies have chosen to deal with the overwhelming amount of DCCTV evidence available to them today. "Oh, there's video? Okay, have someone export it and we'll come back to pick it up."
Let me start by saying that I am by no means trying to imply that DVR, NVR or any other digital or IP based video system cannot produce good quality video evidence. There are even 2 or 3 high-end, mega-pixel quality digital surveillance cameras and systems on the market today whose capabilities far exceed those of a traditional analog based system. However, to my point, it seems more often than not digital based systems are producing very poor quality video evidence regardless of the system's actual capabilities.
So why do DVRs typically provide poor quality video evidence? Here are a few of the common reasons:
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