This is what i wrote in response to the latest news press article.
Once again the claims of Engel homes is unfounded except for removing the drywall. Fosters sealant paint has been added to all the surfaces of a tested home with the drywall in question and did not work. The odor came back after the smell of the paint went away and certain metals continued to pit. I don't under stand why the newspress keeps using Lennar as if they are the only one with a real problem. As far as i can tell almost all the builders have this problem to a certain degree and not at small %s. "Scientific testing shows no indication of any health risks to our homeowners. Lennar has been working with our homeowners on long-term solutions based on the specific testing of their homes" Yes certain ASTM and OSHA testing has been conducted but this is a cumulative issue and not a short term exposure, so no true heath study has been conducted to date meaning testing for chronic exposures.
This article is right about not panicking and to work with your builder, it's just no one has attempted correct type of testing including corrosion studies to analytically find out what is actually corroding the specific metals and comparison studies with the affected drywall and regular US made drywall without the stated issues. Here are a few terms you should look for and research.
KNAUF Flue Gas Desulphurization Pyrophoric Oxidation OSHA 1008 & 1011 combined modified long term test NIOSH 7903 Drywall analysis by XRD for Iron Pyrite