[JRutledge]

I am with Z on this one as well. I have never seen an official of any significance use such a device. I have seen people who are not so knowledgeable use a whistle from time to time. But I am talking about someone that might actually work a varsity game, but are not at all in the top echelon. I have never seen a college official even try such a thing and I have never been to a camp where this was advocated. So maybe this is something that is allowed where you live. Where I live you would be laughed at big time by the so called big wigs that work games or assign them.

Peace