you can even bring your own bottled drinks/liquid on Japan domestic flights. they have a machine specifically for "scanning" drink/liquid. put your bottle on it, green light, then off you go. not sure how it works
There's a UK company in talks with the DoD on rolling these out for military use, and I'm sure they will expand to civilian airports eventually. I'm not sure if this is the same company, but they're doing the same thing:
http://www.theguardian.com/business/2014/nov/02/scanner-anal...
Yes, I was assuming a typical disposable transparent plastic or glass bottle. I have not seen the machine in question, so I am guessing, but it would be very easy to implement and cover the majority of cases.
25 years ago i used to live in public housing in HK where there are around ~60 apartments (~400 sq. ft) each floor. hallway interactions are common, we even leave the door open so people can have a quick chat when neighbor passes by.
Nowadays more people live in private housing, usually 8-10 apartments each floor. And people hardly know the last name of their neighbors. Not knowing who lives next door is the norm in HK private/subsidized housing now...