Is it true: Pascagoula abduction (Charles Hickson, Calvin Parker, 11 Oct 1973)?

There's no solid evidence for it.

The claim is that Hickson and Parker were abducted and physically examined by non-human beings on 11 October 1973. The men kept to their account when secretly recorded and Hickson passed a polygraph, which Philip Klass said was run by an inexperienced operator. Other people reported lights in the area that night. None of this shows that non-human beings were present: no physical evidence of a craft or beings has been produced, the one physical test (a radiation check at Keesler Air Force Base) was negative, and no one is documented as having seen the abduction itself at the time. Later detail comes from hypnosis sessions and recollections decades afterwards. A hoax (Klass) and a hypnagogic 'waking dream' (Nickell) have been proposed, but neither is demonstrated, so the claim is unsubstantiated rather than disproved.