Whistleblowers forcing the world's governments to hand over their collection of UFO sightings could "muddy the waters" of experts searching for elusive creature Bigfoot, it is feared.

While it is "nice to see" public information confirmed by governments across the globe, Bigfoot researcher Thomas Marcum worries about the impact it could have on communities seeking the truth.

Looking at previous interjections by governments offering up their stash of knowledge on beings from beyond the stars, expert Marcum warned of the damage a Bigfoot confirmation could bring.

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