Genre question

[classicdrogn]

Ah, tes, that's the title! I'd forgotten if I ever knew it was by Twain, I just rmember some kid-rated movie from somewhere in the 80s or late 70s and that the plot hinged on determining the guilty party in ... I think what was tiptoed-around for the sake of the rating but in direct terms was a rape case? Anyway, the amazing new technique of fingerprint analysis played a pivotal role.

I don't really rmember, because Ghostbusters was the "fun" movie we rented for after the "educational" one, and, well, Ghostbusters.