Oh, please no. Ham radio has already sullied it's image enough with those. No need to do the same with scanner listeners.
………..
But if you are going to do it, at least go all the way and produce gold plated tin badges that say "Official Emergency Scanner Listener".
mmckenna, I see an opportunity in it for you: Merit badges for the vests. You could be the one to distribute the "I Drilled the Damn Hole" merit badges!

