In certain states, several independent studies found dangerous levels of pesticides in marijuana products. States that have legalized marijuana are struggling to get to grips with the issue of pesticides because the federal government still lists marijuana as an illegal Schedule 1 drug. This means that there is confusion as to which pesticides and what quantities of pesticides can be used, therefore the Environmental Protection Agency does not regulate pesticides when it comes to marijuana cultivation.

Growing marijuana privately is one thing, and if the plants become infested with bugs, it is an easy thing to simply remove them and start again. However, commercial farming of marijuana, or any other crop for that matter, is an expensive business and if there is a pest infestation, growers will spray in order to protect their investment and potential profits.

Source – http://newstarget.com/2016-05-12-pesticides-found-in-marijuana-products.html