I witnessed card doctoring - with Deceptive Intent - as early as 1978-79, which is about the same time I resumed collecting after doing so as a young 'un from 1968-1972.

When I started attending card shows in the early 1980s, I always brought along one of those old clear card measurers, as trimming was already a common concern.

I knew a Pennsylvania card shop owner in the mid-1980s who hired a local kid to sit in the shop's back room and color touch the edges and corners of the owner's 1971 and 1975 Topps baseball cards. I confronted the owner about it, but he didn't think it was any big deal - he was just makin' 'em look nicer.