According to the text, we can infer that _______________.

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Customs

     It was the small hours of the morning, when we reached London Airport. I had cabled London (England) from Amsterdam (Holland), and there was a hired car to meet me, but there was one more contretemps before I reached the haven of my flat. In all my travels I have never, but for that once, been required by carried by the British Customs to open a single bag or to do more than state that I carried no goods liable to duty. It was, of course, my fault; the extreme fatigue and nervous tension of the journey had destroyed my diplomacy. I was, for whichever reason, so tired that I could hardly stand and to the proffered pro forma and the question, ‘have you read this?’ I replied, with extreme testiness and foolishness, ‘Yes-hundreds of times’.

Adapted from Read for Meaning