Air and ocean carriers often unintentionally transport aliens into the United States who do not have a valid passport and/or an unexpired visa. Carriers receive a fine from U.S. Customs and Border Protection of $3,000 for every such alien illegally transported. Carriers can get an automatic reduction of 50% of the fine by signing a Memorandum of Understanding (MOU) with U.S. Customs. Carriers must obtain and submit the new MOU to U.S. Customs on April 23, 2010.