I think there was a class action lawsuit against Zonolite, just recently.
edit
http://www.merchantlaw.com/zonolite.html
double edit
better hurry if you want in on the action
In order to apply for compensation, you must submit a Proof of Claim Form no later than August 31, 2009. You can download the
CDN ZAI PD Proof of Claim Form from that website, which you would need to fill out, sign and return by mail to: