substantiate

His family has said that Mr Nichols, an avid photographer, was out driving so he could take pictures of the sunset.Officers initially said Mr Nichols was pulled over for alleged reckless driving, but police on Friday said there is no evidence to substantiate that claim.The footage released only begins after police confront him at an intersection at 8:24pm local time - police say the initial traffic stop was not filmed but we don't know why.