Can you please tell what is IBIS check? Thank you
Better than that:
http://en.wikipedia.org/wiki/Interagency_Border_Inspection_System
and some other info from CBP
http://www.cbp.gov/xp/cgov/travel/admissibility/authority_to_search.xml
Many travelers wonder if CBP is alerted when an inbound passenger has a warrant for their arrest issued. Yes, CBP is alerted. In the air passenger environment, air carriers transmit passenger information to CBP through the Advance Passenger Information System (APIS). CBP officers also rely on the Interagency Border Inspection System (IBIS) to determine which individuals to target for secondary examination upon arrival in the United States.
CBP, along with law enforcement and regulatory personnel from 20 other Federal agencies or bureaus, use IBIS. Some of these agencies are the Federal Bureau of Investigation (FBI), Interpol, the Drug Enforcement Administration, the Bureau of Alcohol, Tobacco and Firearms and Explosives, the Internal Revenue Service, the Coast Guard, the Federal Aviation Administration, Secret Service, and the Animal Plant Health Inspection Service. Information from IBIS is also shared with the Department of State for use by Consular Officers at U.S. Embassies and Consulates.
IBIS assists the majority of the traveling public with expeditious clearance at ports of entry while allowing the border enforcement agencies to focus their limited resources on potential non-compliant travelers. IBIS provides the law enforcement community with access to computer-based enforcement files of common interest. It also provides access to the FBI's National Crime Information Center (NCIC) and allows its users to interface with all 50 states via the National Law Enforcement Telecommunications Systems.
IBIS resides on the Treasury Enforcement Communications System at the CBP Data Center. Field level access is provided by an IBIS network with more than 24,000 computer terminals. These terminals are located at air, land, and sea ports of entry.
IBIS keeps track of information on suspected individuals, businesses, vehicles, aircraft, and vessels. IBIS terminals can also be used to access NCIC records on wanted persons, stolen vehicles, vessels or firearms, license information, criminal histories, and previous Federal inspections. The information is used to assist law enforcement and regulatory personnel.