Comment Re:Be careful (Score 1) 130
Because 0 lead, arsenic, and mercury is basically impossible to achieve, you are saying not one atom of the above is allowed to be present. I will always be able to detect any really low level of anything.
It's a bit like coal power stations release more Uranium-235 every year than the Chernobyl disaster. Even if it is only one part per billion in coal, given that we burn ~8 billion tonnes of it a year, that is one tonne going into the atmosphere every year.