"...I was trying to find out why Micropur isn't legal to sell in CA!..."

Good luck. I did some looking last night also, with zero results. When the stuff first came out I tried to buy some at REI in Sacramento, they told me it could not be sold in CA, and I also read it on some forum, possibly the Backpacker Magazine's. I didn't try to buy any again, so I don't know if that has changed, or why it was that way in the first place...