Paul Marshall is a senior fellow at the Hudson Institute’s Center for Religious Freedom in Washington, D.C., and has written or edited many books about religion and politics. He served as editor and contributor for Radical Islam’s Rules: The Worldwide Spread of Extreme Sharia Law.

Read an Aug. 16, 2013, Religion News Service story about a federal judge striking down an anti-Shariah state constitutional amendment in Oklahoma. Voters had overwhelmingly approved the amendment in 2010.

Dr. Andrew Bostom is associate professor of medicine at Brown University Medical School in Providence, R.I. He has written several books about Islam, including Sharia Versus Freedom: The Legacy of Islamic Totalitarianism.

Julie Macfarlane is a law professor at the University of Windsor in Windsor, Ontario, Canada. She has expertise in Islamic family law and is the author of Islamic Divorce in North America: A Shari’a Path in a Secular Society.

The American Civil Liberties Union issued a report in May 2011 about the push for anti-Shariah laws.

Read an Oct. 1, 2012, Religion News Service story about how anti-Shariah measures can complicate divorce for Muslim Americans.

Read a June 4, 2013, Religion News Service story about Missouri Gov. Jay Nixon’s veto of an anti-Shariah measure.

The Center for American Progress released a report May 16, 2013, on the status of foreign-law bans throughout the United States.

Read a May 16, 2013, Stateline.org article about state bans on use of Shariah and other foreign legal systems and whether those bans hinder international commerce or have other unintended consequences.