I don’t live in Illinois. How do I know if my state is compliant or that I have a REAL ID-compliant document?

Several states are compliant with the REAL ID Act. Check for the star; generally a star indicates the license qualifies as a REAL ID. You can also visit the Department of Homeland Security website for more information: https://www.dhs.gov/archive/current-status-states-territories.  In addition, a valid passport is a REAL-ID compliant form of identification.