FBI maintained system in 1994 for instantly checking the backgrounds of potential firearms buyers in an effort to prevent these individuals from obtaining weapons. Firearm Owners Protection Act The Firearm Owners Protection Act (FOPA) of 1986 allows a gun owner to travel through states in which their firearm possession is illegal as long as it is legal in the states of origination and destination, the owner is in transit and does not remain in the state in which firearm possession is illegal, and the firearm is transported unloaded and in a locked container. The FOPA addresses the issue of transport of private firearms from origin to destination for purposes lawful in state of origin and destination; FOPA does not authorize concealed carry as a weapon of defense during transit. New York State Police arrested those carrying firearms in violation of state law, and then required them to use FOPA as an affirmative defense to the charges of illegal possession. Law Enforcement Officers Safety Act In 2004, the United States Congress enacted the Law Enforcement Officers Safety Act, 18 U.S. Code 926B and 926C. This federal law allows two classes of persons – the "qualified law enforcement officer" and the "qualified retired law enforcement officer" – to carry a concealed firearm in any jurisdiction in the United States, regardless of any state or local law to the contrary, with the exception of areas where all firearms are prohibited without permission, and certain Title II weapons. Federal Gun Free School Zones Act The Federal Gun Free School Zone Act limits where a person may legally carry a firearm. It does this by making it generally unlawful for an armed citizen to be within 1,000 feet (extending out from the property lines) of a place that the individual knows, or has reasonable cause to believe, is a K–12 school. Although a state-issued carry permit may exempt a person from this restriction in the state that physically issued their permit, it does not exempt them in other states which recognize their permit under reciprocity agreements made with the issuing state. Federal property Some federal statutes restrict the carrying of firearms on the premises of certain federal properties such as military installations or land controlled by the USACE. National park carry On May 22, 2009, President Barack Obama signed H.R. 627, the "Credit Card Accountability Responsibility and Disclosure Act of 2009", into law. The bill