On April 20, the U.S. Supreme Court upheld Arizona’s legislative district boundaries. Harris v Arizona Independent Redistricting Commission, 14-232. The decision is unanimous and is written by Justice Stephen Breyer. Harris v Arizona Independent Redistricting Commission. Here is the decision.
The boundaries had been drawn by an independent redistricting commission. Arizona Republican office-holders are generally critical of the Independent Redistricting Commission, and had filed the lawsuit. They argued that the 2011 legislative plan should have created districts with greater equality of population, but the U.S. Supreme Court said 10% deviation for legislative districts is constitutional, as long as there appears no obvious partisan motive for the population deviation. Thanks to Rick Hasen for this news and the link.