I'm glad that you trust all of your users.

I trust myself, yes. But I also trust myself that if I were to have users again, they would only have write access to a limited set of directores.

Would you recommend your technique for them?

It entirely depends on what they are using find for, (that is, what they are going to do with the results), under which UID they run, and on which directory they run find. Turning on taintness is usually a good idea when running programs with UID == 0. Checking to see whether the returned values start with the expected prefix doesn't hurt. Using -print0 and $/ = "\0" might work too.

Abigail