Ask if this will go on your permanent job record (if applicable) and to get it removed due to the invalidity of the complaint against you.
You wouldn't want to have something like that possibly follow you around.
Again if it's applicable or accurate(I'm no lawyer)
Also I'd be bring ONE BB to at least help distinguish what your "big scary instrument of violence" actually shoots.
Don't show it off, wait to see if the psychologist asks what your gun actually shoots.
my 2 cents