Residents must show valid government-issued photo identification, such as a passport, driving licence or consular document.

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There are still four layers of security: presentation of valid government ID, boarding pass, x-ray inspection of carryon luggage, and passing through a magnetometer for the presence of metal.

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"It was accepted at the time, as it is now, that sales by the Soviet government were valid, as were later acquisitions of the paintings, " it contested.

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