I am not convinced any normal exposure to lead would cause a problem in adults. Children are somewhat at risk because they like to chew paint and often swallow it. I know I did as a child, as well as working at the "casting box" of a newspaper melting lead and casting the ads and wirephotos for the press when in my teens.

Airborne lead and leaded-gasoline residue is a non-issue in my opinion, much like silicone implants, DDT, Alar on apples, and a slew of other wacko "outrages".

However, there are some occupations where it's a hazard; most obvious one is house-painters who mixed their own paint using white lead, linseed oil, and turpentine. The painter in my home town who painted hundreds of houses in the 40's and 50's eventually died of lead poisoning in his sixties. He used no protection, not even gloves and his face and arms were covered with paint at the end of a day. Even so, it takes a while. There was also a house painter in Germany about that time that some think went insane from the paint. Think his name was Adolph something.

Regarding testing, you probably won't find it in a blood test anyway. The long term damage is when it is deposited in bone tissue. So you need a piece of bone (digital test?) to see anything.