There are no taxes on certain rodenticides in Canada because they are considered essential items for pest control and are therefore exempt from taxes. In some cases, governments may also exempt certain items from taxes in order to make them more affordable for consumers.
It's also worth noting that the regulation of taxes on rodenticides and other pesticides is often determined at the provincial or territorial level in Canada, rather than by the federal government. This means that tax policies may vary depending on the specific province or territory in question.
However, it's important to remember that the use of rodenticides can have negative environmental impacts, and it's always a good idea to follow the instructions on the product label carefully and consider alternative methods of pest control whenever possible.