I do know this for a fact that all fabric imported into the USA has to be treated with formaldehyde either in granular or gas form at the port of entry. I read the MSDS -Material Safety Data Sheets- at the store where I worked.
This is why you should always wash your fabric when you get it home so you have less exposure to it yourself, while handling it.
By the way this also includes all clothing, towels, wash cloths,sheets any thing made with fabric and imported. It makes you think twice.