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Could pass over wreckage and miss it? >> it's unlikely. the bottom has a soft layer on it. it's not that deep. these are large pieces of wreckage, you would assume large pieces of wreckage coming from an air frame as big as the 777. chances of something that size being missed is very, very slim. the image quality coming out of this type of sonar that's on the bluefin is quite good for large objects like this. >> you think about other situations where a similar device was deployed. air france, for example, it took four extensive underwater searches. i believe it was nine days into the fourth se...

From a drone looking down on people, flying into inaccessible places is quite amazing. >> and what did you think -- many times the u.s. government or other governments conduct air strikes using drones, say -- there is a discussion about the image quality and not being able to determine who is who in some of the imagery. how did you find it as a photographer, the clarity of the image, especially when drones were flying over groups of people, exercising, praying, celebrating in some fashion? >> you know, my drone was not the most expensive one, but even with the technology i have, i could have i...

Solutions to analyze the hundreds of hours of surveillance from lounds high school. although he does not believe the jumpy video is the result of editing, he says there are other major problems. >> those files are not original files. they're not something an investigator should rely on for the truth of the video. they've been altered in a number of way, primarily in the image quality, and likely in dropped information. information lost. there are also a number of files corrupted, because they've not been processed correctly and not playable. i can't say why they were done that way, but they we...

>> reporter: cnn has hired grant fredericks and his team at forensic video solutions to analyze the hundreds of hours of surveillance from the high school. although he does not believe that jumpy video is the result of editing, he says there are some other major problems. >> those files are not original files. they're not something that an investigator should rely on for the truth of the video. they've been altered in a number of ways. primarily in image quality. and likely in dropped information. information loss. there are also a number of files that are corrupted, because they've not been p...

All right, let's begin where we left off. an exclusive investigation into the death of the georgia teenager kendrick johnson whose body was discovered in a rolled up wrestling mat in his high school's gym. we have more on what the surveillance vid crow can tell us about what he died and maybe more importantly, what is missing. >> cnn hired this man to analyze the hundreds of hour s of surveillance from lowndes high school. although he doesn't believe the jumpy video is the result of editing, he says there are other major problems. >> they're not original files. they're not something an investi...