The danger that actually happens in real life in the US is from imported ceramic items because the lead is in the glaze used to color/seal them. Uncoated glass wouldn't have that danger. I'm not sure if there even is any rule about poison glaze used in something not meant to be eaten from (like a decorative candle dish or something we might use for a reptile water container.)

Lead glaze can be found in pet or people ceramic dishes from even reliable sources (there are recalls when discovered but not for very old dishes made before the danger was known). You can easily test any dish (or look for warning signs mentioned in the link I posted above) you are concerned enough to bother with. Ceramics can even be radioactive. Before 1973, uranium was used in the glaze of orange-red Fiesta dinnerware (a well known expensive human brand). Google that one up if it sounds preposterous.

The problems today are much more likely in cheap imports made in countries with poor regulation. Chinese pet food and baby formula have been found to contain very dangerous and lethal ingredients. They certainly don't carefully police and inspect the glaze used in dollar store dishes. I wonder what amount of money the Asian factory even gets for each dish?

I don't like to think I'm paranoid, but before kitty or small dog gets a water dish they will eat out of for 10-25 years or more, I want to be at least a bit careful especially for the very small animals. I'm a lot more cautious with my 10 pound dog getting a bit of something than I am with the 100 pounder.

If I had a small bp that was a habitual soaker, I'd worry IF any lead danger to BPs even exists.