Edited sentence: As of August 2013, 17 U.Federal "Gun Show Loophole" bills were introduced in seven consecutive Congresses, in 2001 (), 2004 (), 2005 (), 2007 (), 2009 (), 2011 (), and 2013 ().Four require background checks on all handgun purchases at gun shows: Hawaii, Maryland, New Jersey, and Pennsylvania.None passed.Seven states require background checks on all gun sales at gun shows: California, Colorado, Connecticut, Illinois, New York, Oregon, and Rhode Island.Six require individuals to obtain a permit that involves a background check to purchase handguns: Iowa, Massachusetts, Michigan, Minnesota, Nebraska, and North Carolina.The remaining 33 states do not restrict private, intrastate sales of firearms at gun shows.states require background checks at gun shows