I've been googling around, trying to find LD's possible history of cheating in school, with no luck. If it happened in the 1970s or earlier, and never made it into an article which is archived on the internet, it will take more detective legwork to root it out. If it happened, it was probably back in Maryland in the late 1960s or early 1970s. I had heard he was expelled from school for plagiarizing or something like that, but I can't recall enough particulars to nail it down.