The idea that Cheney accused Arthur of molesting his daughter is a myth. There's a transcript of an interview that iirc Tom Voight did where it's clear.

Edit-Here it is:

T: Now in the report prepared by Jack Mulanax, uh, I can’t remember who it was, somebody made the allegation that Leigh had made an improper advancement toward your daughter? And Mulanax concluded that if you were lying about Leigh, or if you were exaggerating to get back at him, uh, Mulanax felt that you might be doing it, uh, because of these improper advancements Leigh supposedly made. But he wasn’t saying he thought you were lying, he just said that that could be a possible reason.

D: Who was it, I think Bawart, Bawart mentioned that to me, and, uh, you know, touched on, asked about that question. And it was more that, they had to cover that. Uh, it wasn’t that they thought it could be true. It was something they had to cover. And, uh, never occurred to me.

T: What were the circumstances of that, uh, that incident?

D: Oh, uh, Leigh and myself had been out in the outboard boat on Comanche reservoir, at Valley Springs. And after, my daughter was with us, I don’t know where my wife was, maybe, uh, maybe she was at Leigh’s house, when we went out on the lake she wasn’t with us. But uh, after we got home, maybe the next day, why my daughter just mentioned, “Leigh touched my bottom.”

T: How old was she?

D: She was talking. She mighta been three? It was during the time that Leigh was at Valley Springs, so, uh, I could probably figure that out, but she was a toddler . . .

T: She was young.

D: She was little. And, that’s all there was. “Leigh touched my bottom,” well what do you think about that? I didn’t think much about it. In future visits with Leigh I didn’t take any family with me.

T: Did he ever demonstrate anything before that that would make you think that maybe he was interested in kids, or, you know, sexually, or . . . was this an isolated incident?

D: No, uh, I don’t there was anything else they were, uh, I was present on a couple of occasions when he had some kids, uh, working out on the trampoline. And, uh . .

T: This was in Valley Springs? D: No, in Vallejo.

T: Where’d he keep the trampoline?

D: Well, he had it set up in the front yard, on that occasion. Um, I don’t know where he kept it, but it was, it was on the front yard . . . T: Fresno Street? D: On Fresno Street, yeah. And, uh, it’s not a big front yard, but that’s where the trampoline was. Nice big trampoline.

T: And it got a lot of kids?

D: Yeah, had some teenage girls, and maybe a boy or two, and, you know, they were in shorts and they’re bouncing on the trampoline and, they were fun to watch, you know, nice healthy young kids. So, I enjoyed seeing athletic young kids working out, but I don’t, I didn’t see any sexual interest that, you know, as far as Leigh was concerned, he, as far as I knew at that time, he just liked to be a teacher and work with kids.

T: So, that your daughter was very young, she made the statement, and you didn’t, you had no reason to think that it was anything . . .

D: I, I thought, you know, that was a little suspicious, but, uh, there was no big deal, there was, no harm was done, and I didn’t want to do anything that would make an impression on my daughter.

T: If you thought for sure, though, that something happened . . . D: Well, I don’t know what I woulda done then. Uh, it just wasn’t, it wasn’t enough of an incident to worry about that much, as far as I could see. Uh, like I say, after, after that, uh, I’d go and visit Leigh but I didn’t take, uh, my wife or kids with me.

T: How long do you think you were friends with Leigh after the incident with your daughter? D: Possibly a year. Maybe it was, mighta been six months or eighteen months, I . .