The liquids ban had not long come into force when a woman produced a bottle of medication from her hand luggage.
"The security officer said: 'Can you just taste that for me, please?'" McMillan recalls. "So this lady took a swig, then grimaced as if she was going to vomit. When he asked if she was OK, she replied: 'Oh yes, it's just I don't normally drink it, I usually rub it on my back.'"