Juicers and regular leafy vegetables

Question

Can I juice leafy vegetables not grown with special insect-free supervision, using a juicer for hard fruits and vegetables? The juicer grinds the flesh of the fruit/vegetable, and then separates the flesh from the juice by a centrifuge and a fine filter. The filter holes are extremely fine and rarely, if at all, does fruit or vegetable bits mix in with the juice. Note that in order to produce a little bit of juice a lot of vegetables are needed, so the cost of using supervised insect-free leafy vegetables for this purpose is very high.