The wife and I took the kids to the Great Wolf Lodge down in Naples, it's an indoor water park over the winter break and, uh, I can confirm there are scales before you get on the water slide. And it is visible to the public eye, the workers weigh, you and your family. If you are underweight, you can continue to go down the slide as for this 1 guy that I witnessed was overweight. Even by himself they escorted him to another slide which was capable of handling his volume and mass. And everything proceeded as normal, but the scales do exist.