Until about two years ago, it wasn't that often that I’d encounter Variable Frame Rate (VFR) video evidence, unless of course the case included video recorded by mobile phones. Times, they are a changing my friend.
DVR/NVR manufacturers are leveraging the advantages of VFR more often these days. And why shouldn't they be, especially when we’re seeing even the high-end professional video recording equipment start to use VFR more frequently. Throw in the want/need to get to Ultra HD before the next guy, and suddenly you've got a decent argument for VFR.