Las Vegas alien video's previously missed detail proves 'authenticity,' expert says: 'You can't deny it'

When a Las Vegas family told police they saw something "not human" in their backyard, they were not lying, a veteran crime scene recreation expert said. 

Scott Roder, of Evidence Room Animation and Exhibits, used his expertise and motion tracking software to analyze the video of a purported UFO crash landing in Sin City last April. 

He told NewsNation they tried to "debunk" the responding officers' bodycam footage or prove something was added to the video. 

Now, he said he is...