The way I read the CO regulation (list has grown to 37 pages since I looked a year ago was about 20) if the manufscturer claims pesticide then it falls under the regulation. In the case of dyna gro neem oil sold as leaf polish is exempt. Look on the list and only very few products with neem (cold pressed or hydrophylic extrsct) are approved for comercial, some are, some arent. Many of oils and such have very long half lives, this is one area Im willing to accept better living through chemistry to a limited extent. Like veg only. DE a good general.