1) yes. What specifically, I have no idea. Frequently companies disclose more information just to make sure it's enough. There is a lot of documentation on these laws and they vary with industry, product segment, and country of origin.
2) It's not generally readily available, but the more modernized the supply chain gets the more easily it will be found
3) same as 2, some could get neglected, others happen quickly because of short timing between passage and data processing
4) of course they do, just look at how they handle taxes.