This is actually something (SCP in American schooling) no one needs to unduly get raised blood pressure over, as I have opined elsewhere, the total abolition of SCP must be an eventual certainty. IMHO, so long as there is no comprehensive and unified procedure in place, and so long as the preference is to apply an implement to the bottom, that for a variety of reasons can result in “excessive” bruising, it is near certainly that in every ISD at some point an incident will occur appearing excessive.