Of course they claim there is no leeching: there is no way to prove it ex ante so even if the claim is false it will be decades before any downside to making th

Of course they claim there is no leeching: there is no way to prove it ex ante so even if the claim is false it will be decades before any downside to making the claim arises. As the other commenter notes, this is pretty common among new chemical products. "There is no harm" -> "The harm is marginal" -> "The harm is manageable" -> "Remediation is too expensive for the private sector, the government needs to fund the fix"