Hazardous Liquids

The TSA security screening in US airports requires me to pour out all the water from my nalgene bottle because it might be some kind of colorless liquid explosive or hazardous chemical. At Chinese airports, the security personnel have the same concern, but merely ask me to take a swallow from my water bottle in front of them. In addition to being amusing, these differences in practice tell a fair bit about the national cultures in the respective countries. I'm curious to know what the practices of other countries' security screenings are. 

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