The problem with this line of plausible but non-scientific thought is that you base it solely on 'blood lead levels' as though they would be constant, without e

The problem with this line of plausible but non-scientific thought is that you base it solely on 'blood lead levels' as though they would be constant, without explaining the process taken to test. The latter part is critically important with heavy metals. Heavy metals in general never stay in the blood very long, the body binds them as quickly as it can, and the only way to accurately test involves taking a chelator first (to cause it to release into the blood stream) and then testing for acute poisoning (by causing it). There may be newer methods that have been developed since, but as of 2008 that was true. Anyone who has suffered mercury or lead poisoning that was diagnosed by a medical professional would be aware of this, which is why there is no safe level, it bioaccumulates, and is a time-bomb for acute poisoning if it ever gets released. Incidentally cilantro is a powerful chelator, and is used in food. Many people who have suffered poisoning get powerful headaches and other poisoning symptoms which can mimic many symptoms on the ADD/Autism/ADHD spectrum when eating this food, and often themselves don't know why.