The lead paint laws here are much stricter and complicated. It includes the specs on the masks,hepa vacuums and even the plastic bags you use
I've noticed that. I don't know if there's a reason for the difference or not.
I've always known of the risk, so I've always been carefull, but not to the extent of using special equipment.
It's not uncommon to see an old appartment with paint dust lying on the windowsill, although I've no idea if it's lead paint.
In fact, it's even normal to see people living in places that look like they haven't been painted in decades, with paint dust lying on the wondowsill.