KANSAS CITY, Mo. (AP) – A requirement that Missouri voters show photo identification at the polls is set to take effect.

A little under two-thirds of voters during Tuesday’s election approved a constitutional amendment to allow for such a law. That means a photo-ID requirement passed by the Republican-led Legislature can be implemented. Voters after June 2017 must present a government-issued photo ID at the polls under the new law, with exceptions.

But Republican supporter Rep. Justin Alferman says the constitutional amendment almost certainly will be challenged in court.

Alferman says exceptions were included in the law in an effort to help it survive legal challenges. He cited an exception that allows voters without a photo ID to sign an affidavit and vote anyway, as well as a requirement that the state pay for identification.