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The practice of price optimization, or using certain non-risk data points when determining a policyholder's rate, is under scrutiny in the U.S. In these states, the practice is banned. (See related article)
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Maryland

Maryland was the first state to ban the practice, on Oct. 31, 2014.
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Ohio

Ohio followed suit on Jan. 29, 2015.
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California

California was next, on Feb. 18, 2015.
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Florida

Florida issued its bulletin on May 15, 2015.
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Vermont

Vermont was next, on June 24, 2015.
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Washington

Washington's advisory was issued July 9, 2015.
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Indiana

Indiana issued an advisory on July 20, 2015.
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Maine

Maine Bulletin 405 on Price Optimization and Elasticity of Demand was posted August 24, 2015.
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Pennsylvania

The Keystone State posted its bulletin on Aug. 31, 2015.
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Washington, D.C.

The nation's capital banned the practice on Aug. 31, 2015.
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Rhode Island

Rhode Island was next, on Sept. 15, 2015.
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Montana

Montana's bulletin was issued on Sept. 18, 2015.
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Delaware

On Oct. 15, 2015, Delaware announced a pending ban.
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Colorado

Colorado joined the list on Oct. 29, 2015.
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Minnesota

Minnesota was next, on Nov. 16, 2015.
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Connecticut

Connecticut banned price optimization on Dec. 4, 2015.
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Alaska

Alaska followed quickly, on Dec. 8, 2015
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Missouri

Missouri is the only state to ban price optimization so far in 2016, doing so on January 12.