Question: In 2009, the U.S. Environmental Protection Agency issued a cancellation order to phase-out and eliminate the use of organic arsenical pesticides by 2013, with one exception. What chemical was not included in this cancellation order?
Answer: Not included in the EPAs cancellation order was monosodium methanearsonate (MSMA), a broadleaf weed herbicide for use on cotton. (Bencko V and Li Foong F. The history of arsenical pesticides and health risks related to the use of Agent Blue. 2017 Anns Ag Env Med 24)2):312-316)