It requires police to demand proof of citizenship if they suspect anyone they stop is in the US illegally.
Key parts of the law were suspended last year after a challenge from the White House, which holds immigration to be a federal, not state, issue.
Arizona’s legislation led other US states to pass their own measures targeting illegal immigrants.
The White House has also challenged similar laws in the states of Alabama, Utah and South Carolina. Private groups have brought lawsuits against immigration laws in Indiana and Georgia.