Preventing reopening of rejected tickets

I would like to prevent the reopening of rejected tickets by any but
superusers. Is this possible? By default, if I reject a ticket, a user
or one of my privileged users replies, and it’s reopened.

Thanks,
Fran

Fran Fabrizio
Senior Systems Analyst
Department of Computer and Information Sciences
University of Alabama - Birmingham
fran@cis.uab.edu
(205) 934-0653