Not true. The first desk you clear at the airport is Immigration. Then you pass through the duty free and collect your checked luggage. Then and only then do you clear customs. I have had them question my 2 one liter bottles and the lady did say she would charge me duty. I reminded her that travelers from abroad are allowed 2 liters of liquor. She didn't like that I corrected her. That is correct, 2 liters per person, but she didn't like that I knew more than she did.