A ruling could come down today in Detroit federal court which will either uphold Michigan’s ban on same-sex marriage, or declare it unconstitutional.

County clerks, including Barb Byrum in Ingham County, say they’ll be ready to "follow the law" almost immediately after Judge Bernard Friedman's decision.

Byrum says her office would be able to issue marriage licenses to gay couples "within minutes," should the ban be struck down.

Byrum says, "I am prepared to issue licenses to opposite-sex couples at this time, and then if it is law and it is legal, then certainly same-sex couples at that time as well."

The state’s same-sex marriage ban, passed by voters in 2004, is being challenged in a federal lawsuit filed in Detroit.

Those opposed to same-sex marriage believe marriage should only be between one man and one woman, many for religious reasons.

The trial, though, has been dominated by testimony from social scientists and other experts about research, or a lack of research, on children and same-sex households.

If the ban is struck down, Michigan would become the 18th state in the country to legalize gay marriage.