Is it true: Betty and Barney Hill Abduction?

There's no solid evidence for it.

The Hills were a real interracial couple (Barney was Black, Betty was white — unusual for the era) who reported seeing unusual lights during a September 19-20, 1961 drive in New Hampshire. Following the sighting, Betty had recurring dreams of abduction. Starting December 1963, both Hills underwent hypnosis with Dr. Benjamin Simon producing accounts of alien abduction. John G. Fuller's 1966 book The Interrupted Journey brought the story to mass audience. Alleged "star map" Betty drew under hypnosis has been variously interpreted as representing the Zeta Reticuli star system (Marjorie Fish analysis 1974, later contested). Betty's stained dress (kept at Betty's house, now at the University of New Hampshire) was tested multiple times; results inconclusive. Critical analyses (Martin Kottmeyer, Robert Sheaffer) note the Hills' hypnosis narratives closely match alien-abduction tropes from 1953 film Invaders from Mars and other contemporary sci-fi. The Hills themselves were apparently sincere; the question is whether their memories reflected real events, confabulation under hypnosis, or cryptomnesia.