An Oklahoma voter identification law approved by state voters in 2010 meets constitutional requirements, the Oklahoma Supreme Court ruled Tuesday.

"Requiring voters to show proof of identity serves to protect the integrity and reliability of the electoral process and prevent in-person voter fraud," the Supreme Court said in its opinion.

The state law that was being challenged gives individuals several options for verifying their identity in order to obtain a ballot and vote.

Showing a valid Oklahoma driver's license or other approved form of photo identification — such as identification cards issued by the federal government or Indian tribes — are listed among the acceptable options.