Wisconsin Gov. Scott Walker has signed a new voter identification law that requires voters to show an ID with a photo when voting. Student ID cards issued by universities can pass muster as long as they contain the student’s signature and have an expiration date that falls within two years of the card’s issuance.

That may be a problem for some schools. For instance, IDs issued by the University of Wisconsin currently don’t meet that criteria and would have to be updated before students could use them to vote.

The new law requires voters to present a driver’s license, state ID, passport, military ID, naturalization papers or tribal ID in order to vote.

Opponents are expected to challenge the constitutionality of the law in court. The law takes effect next year.

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