"Several things were evident to the investigators at this first meeting. The three women witnesses were sincere about what they had experienced, they were suffering from the so-called “beam,” and there were obvious physical scars from the encounter. Smith lifted her hair up, and showed a mark on the nape of her neck. It was a roundish, pinkish-gray blotch, the size of a half-dollar."
https://www.theblackvault.com/casefiles/1976-stanford-kentucky-abductions/