In california, prisoners were racially segregated each time they entered a new correction facility, as a way of preventing gang-related violence. this unwritten policy was reviewed by the u. s. supreme court in 2005, in the case of johnson v. california. what was the court's ruling, and why?

In 2005, the U.S. Supreme Court case of Johnson V. California go through that unwritten policy and held that the policy was unconstitutional for the reason that it didn’t help a persuasive state concern and that is irrelevant to the legitimate security needs of the prisoners. 

it provided for equal trade rights among nations in china.