>> "Security guards search workers' bags and pockets
  >> as they leave the factory."
  >
  > Same in the USA, especially in warehousing/supply
  > chain jobs.

You're also forgetting casino workers. The people in casinos that handle money are all required for to have whatever purses/bags they bring to work be transparent (usually plastic). I've seen the same thing for workers at airports too. [ I was sitting at Newark in the middle of the night once and a ton of workers came into the terminal from an employees-only door and all of them had clear plastic purses and backpacks. ]

{edit} I was sitting at the airport waiting to talk to an airline rep about getting on the next plane out. I was caught up in this: http://www.telegraph.co.uk/news/worldnews/northamerica/usa/6... and missed my connecting flight (since it was cancelled due to the terminal being locked down).