Flutterby™! : incomplete reporting

One thing bothers me about this report about formaldehyde levels in FEMA trailers for evacuees of New Orleans: Are the FEMA trailers special somehow, or is this just that all cheap abodes use cheap formaldehyde laden plywoods, particle boards and fiberboards, and we need to account for this on a grander scale? I want to know if perhaps this isn't a matter of FEMA incompetence, but rather a larger issue with potentially dangerous construction materials.

I bring this up because as we're planning various projects we're looking at materials, and we'll probably end up using a bunch of veneered plywood or MDF (probably plywood), and one of our considerations in buying these materials is going to be making sure that they're formaldehyde free. This will cost a premium, but I'm wondering what else I need to be on the lookout for...