Nineteen other states already have their own versions of the federal RFRA: Alabama, Arizona, Connecticut, Florida, Idaho, Illinois, Kansas, Kentucky, Louisiana, Mississippi, Missouri, New Mexico, Oklahoma, Pennsylvania, Rhode Island, South Carolina, Tennessee, Texas, and Virginia.
Another 11 states have courts that have established RFRA as a legal precedent, according to Christopher Lund, a religious liberty expert at Wayne State University Law School: Alaska, Hawaii, Maine, Massachusetts, Michigan, Minnesota, Montana, North Carolina, Ohio, Washington, and Wisconsin.
RFRA gives courts a legal test for cases: The government cannot substantially burden someones religion unless it has a compelling interest and uses the least restrictive means for accomplishing that interest. That gives courts a clearer guideline than the First Amendments free exercise clause when considering religious freedom cases.
Perhaps President Bill Clinton explained the law best, when he signed the federal RFRA in 1993: What this law basically says is that the government should be held to a very high level of proof before it interferes with someones free exercise of religion.