Inspired by A double-agent with a conundrum. Everything is hypothetical and while the choice of countries is important, they serve no political purpose.
Tension between the US and China is rising. You are a senior officer working for the CIA, in charge of protecting secret technology from the hands of Chinese spies. You also appear in public often, making you the target of many hostile groups.
One day, there appeared a video, showing you conversing and divulging classified information to a Chinese intelligence counterpart. Espionage, if charged, means maximum security prison for life. The problem? That was not you. You believed that the Chinese government hired a body double and faked the video from mainland China to frame you for espionage. You have to prove your innocence before it's too late, because the system will err on the side of guilt unless there exists "smoking gun" evidence.
You scrutinized the video. It started with the title "CIA senior officer at a secret meeting in Denver, August 2nd 2019." The video then cut to a likeness of you, sitting opposite a desk from two other Chinese senior ranking officers. The video seems to be captured by a hidden high quality camera. The faces were blurred in the video, but the voice sounded exactly like yours. The room was white, illuminated by bright fluorescent light. Besides the desk, chairs, and a clock on the wall, the room was bare. Nothing about the furniture could have told you anything about its origin. Your likeness was able to capture you quite well, and copy your very mannerisms and accent. He must have watched a lot of your interviews. He even wore everything that you have, down to the wrist watch. You know that everything talked about in the video is true, but the Chinese could have known it already from previous espionage attempts. The metadata was stripped bare, and no one knows who tipped the video in the first place. You also cannot unblur the face to show that it is actually not you.
Suddenly, you had an idea. You went back to your computer and used one last forensics trick...Bingo! The Chinese might have tried very hard to hide anything that revealed the video's actual location, but this showed that the video is recorded in China and not in America! Coupled with the fact that you never left America, you have found the smoking gun to prove your innocence!
What is your evidence?