Mexicans who have no Indian blood would still be classified as Hispanic, a race classification that is not genetically determined. Be careful though, lumping all Native Americans is one huge group is not being very respectful of them.
Lead wheel weights have been banned in the EU since July 2005, and Japan and Korea are phasing them out. Yet EPA has refused to enact a ban, instead relying on voluntary industry action.
For everyone born before leaded petrol was banned in Australia in 2002, after the age of 6, a blood lead test should be done every 5 years throughout life, or more frequently if the blood lead level exceeds 2 g/dL.