Chandler police say they made 13 arrests and seized more than $270,000 from suspected drug buyers in three separate November sting operations.
Police say 13 accused dealers attempted to buy a total of more 600 pounds of marijuana in the stings on Nov. 4, 8 and 18.
The Arizona Republic says the marijuana deals were "reverse stings" — when law enforcement is behind the attempted sale of the product, instead of trying to purchase it.
Police say all three marijuana deals took place in Phoenix and involved go-betweens, police surveillance and alleged drug dealers. They say most of those arrested are illegal immigrants and many have extensive records.