Regarding height checks
SeaWorld Experience many years ago:
We measured all of our posts every morning at each ride, it was part of our checklist. We would even get a measuring tape from a supervisor if the parents got on our case, to verify the height of the posts. We also had wristbands at greeter so they wouldn't have to be rechecked on the platform if they were close.
Problem is, we've also seen adults switch wristbands on their kids before (one that is clearly over X inches switches with someone under who didn't originally have a wristband, so they both can ride), and hence why sometimes we take the extra 20 seconds to recheck a child even if they have a wristband, especially if it looks suspicious and poorly put on. I can count at least 4 or 5 times (granted that's over several years, it didn't happen THAT often) where I've had to REMOVE a band off a kid because they had terrible parents abusing the bands, using tape, etc. Then they cause a scene when they are 4" under, security has to get called, etc. it does happen.
If it's very close and they are ever so slightly under and have a wristband that's one thing, and they can ride, but if they visually looked under, we always double checked and reminded the parent it was for their safety and apologise for the inconvenience.
I'm pretty sure the SOP's mentioned this as well, that it's always ok to recheck even if they have a wristband, because of those who will really do anything to get their kids on a ride. It's not any different from stuffing your shoes in the parental sense... people will always do anything to skirt around the rules. We didn't recheck often, but sometimes we HAD to. Obviously some judgement calls to recheck are better than others.
It's one of those things as an op... you don't want to lose your job or god forbid have someone get hurt that ends up being your fault because a kid was clearly too short to ride.
Does it suck as a parent? Yes. Is it an inconvenience? Yes. But we can't always have nice things because of the bad people who want to skirt the rules.
Why have a wristband system at all, one could argue, but we wouldn't check everyone again just for the fun of it. Wristbands were more for the "how come they were able to ride this, but not this" when it's too close to call.
Just explaining the other side of the story. It can be a sticky situation.
What happens when someone shows you an on-ride photo of their kids riding earlier in the day, or a few days before, or whatever? As a supervisor, you don't know who let them ride, but now you are the one saying your staff was in the wrong and put your child in danger earlier in the day if you are saying you can't let them ride now for safety reasons.
And that's why I'm no longer in ops