Possible to limit the amount of times a user can use a command?

I want to do a !here command that will log the amount of times someone has been in the stream, however I only want people to be able to do this once per stream, sort of as a roll call.

Ive gotten [ !here $(touser) has been in chat $(count) times! ] to work correctly however its still able to be spammed by viewers. Any way to make it so its only able to be done once per person, per stream?

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