This sounds like they only did the self policing ahead of inspection, and as soon as it passed it was business as usual, which is not how a company should behave.
This is how literally every "inspection" of everything ever works at scale.
"Oh, the X department has a review coming up, better send the X review prep team to make sure X is Xing like they should and light a fire under their ass to fix it if not".
Sure X is supposed to be ensuring compliance continuously but we all know where that falls on the priority list so hence things only ever get fixed in the pre-inspection inspection.
Edit: Yes I know they falsified records. I'm talking about the general case here.
To be fair random inspection is the only (albeit imperfect) way to work. If you give notice you are easy to game.
That said I remember teachers doing lessons specifically because an unplanned school inspection was happening. Some things can still be gamed. Perhaps the only option is find a way to measure continuously if at all possible, and make sure the risks are high enough to not be worth taking...
What else? Probably make it financially better to go above and beyond environmentally? So it's not a cost centre.
