 Efforts are undertaken to prohibit battery cages in countries around the world, including Bhutan, India, Brazil, Costa Rica and Mexico.Attempts to change the law have been an object of contention; RSPCA Australia has been officially campaigning to abolish both battery cages and furnished cages and to prohibit the sale of cage eggs ever since the 2001 revision of the Poultry Code.The 2009 'Code of Practice' permits the use of battery cages.