How to trap !sh at keyboard

It seems that some of our users are inclined to key in '!sh' at the shell prompt, which promptly shuts down our Red Hat Enterprise 3 Server, interrupting everyone else's work. Is there a line that we can add to the inittab file, that will trap this string, in the same fashion that the 'ca::ctrlaltdel:/sbin/shutdown -t3 -r now' line traps Ctrl-Alt-Delete inputs?

Thanks

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