That's the nature of the beast in UFOs. It's really hard to verify things with 100% certainty. I wish they just release the craft and the biologics instead of prancing around the topic like this.

This entire UFO program is probably so compartmentalized and the material and info so chopped up into small pieces that having one or a couple that's willing to speak out publicly about it can be easily discredited. Not to mention, the apparent attempts of the USG to gaslight the witnesses and the public about this phenomena.

Just like with the NSA surveillance program before Snowden dumped all of that confidential information, this entire UFO saga will always be shrouded in doubt until someone spills the entire thing for everyone to see.