We did hear a story in Idaho where they walked in on prisoners watching a Khan Academy video about building a motor (https://www.khanacademy.org/science/discoveries-projects/dis...). Since motors are contraband (see https://www.youtube.com/watch?v=Edc37hoSD7Y), they had to remove the video.

> I'm sure they don't expect a how-to on making a shiv half way through a KA video

If the prison doesn't screen and approve, a computer technician could smuggle banned content in among the regular Khan Academy videos.

When I explain the screening criteria to people, the anecdote I use is that we had to delete the clipart from MS Office because one of the images was a star-of-david, which apparently has some alternative applications such as communicating gang affiliation. (No, there is nothing stopping a user from exercising the symbol by way of unicode character.)