I recently bought what I thought was pressure treated railing pickets. But now that I look more carefully at the label, there is no [UC code](http://www.awpa.com/references/official.asp). My understanding is that each piece of PT has to be labeled with a UC code. This looks like PT, but the tag just says WeatherShield, and on the back of the tag: "Do not burn treated wood", and "Above Ground Use Only".

Does anyone have experience with this, or can tell me what it really is?