I'm wondering where you draw the line of what is considered moonlighting - do you mean absolutely any paid work whatsoever?
What if it's nothing at all to do with their job?
What if the tech guy wants to work in a dog pound for the day off, or the marketing girl wants to instruct surfing?
Is it "any paid work at all"? What about unpaid/volunteering?
What possible reason could they have given to order him to stop?
And what would give them the right (or make them think they had the right) to do it in the firstplace :/
What if it's nothing at all to do with their job? What if the tech guy wants to work in a dog pound for the day off, or the marketing girl wants to instruct surfing?
Is it "any paid work at all"? What about unpaid/volunteering?