Yeah, Nintendo threw in the DS cart towel since the DS was no longer their cash cow. 1.4.5 was the last DSi update, and I think somewhere in the 6.x firmwares was when they stopped blocking the DS carts in the 3DS firmware.
While I know you mean in case of someone confusing schooling establishment from shooting establishment (many of the same letters) I am still going to read that as lockdown (also known as lock in) for a pub
being drunk in school was either because drunk on playing field or could not be arsed with one particular Thursday afternoon so went and had some beers and played some games instead before returning for an ill advised last lesson/period