Not necessarily-- there are several well established soc. CDTA-- NADTA etc etc. but they all pretty much follow the same guide lines.
I was an Examiner for the NADTA, and we adhered to the " english soc. " divisional breakdown, in International style .
have judged numerous comps. in many cities at many levels . the more prestigious events, tend to go strictly by the book ( with an invigilator ) smaller events, can pretty much be open season, after bronze level ( even that raises some questions ! )
many yrs ago, it was chaos at some of the smaller non sanctioned events .