Comment by nijave

>Is it ok that my son stopped at my desk at home and saw customer PII that was left open?

In practice/reality, probably. Most employers will disagree.

Consider your son could just as easily over hear a phone call, see a piece of paper, etc. If your son was actively malicious, there's all kinds of things from cameras to video splitters to key loggers he could do. If he's not actively malicious, who cares if he sees something

If you're in a line of work worried about shoulder suffering, then you should really consider whether BYO is a good idea.