Originally Posted by Steve
Welcome to our forum!
Have you considered spraying organic materials? You wouldn't need a license then.
Don't be so quick to assume organic chemicals are free from licensing regulations.
Any chemical (organic or otherwise) intended to kill weeds is, often, considered a herbicide due to its intended purpose. In many states, you need an applicator's license to apply any herbicide in the course of doing business.
Andy, in Canada, probably has a special exemption which covers his brand of organic weedkiller. That exemption may, or may not, be applicable here in the U.S.
Each state's licensing requirements are different and I am certainly not an expert on each state's regulations. I do know, however, my local enforcement agencies are real sticklers and they've handed out quite a few $5,000 fines this year to LCOs violating application regulations.
Check with your local Ag. office and gain a full understanding of your local regulations.