From our home airports- all of our luggage is hand searched before we even get to the check in gate. We are standing there watching them. They don't lift everything out. Usually lift stacks to look and run some kind of little sensor over everything. one time I had a small box of matches in my checked luggage, they pulled them out came and showed them to me. They had to test one to make sure they were strike on matches. REturned them to me and told me to keep them in my carry on.
We do try and pack as much as we can in airbags and ziplocks, especially our underwear and anything in bottles that might leak. We were told by one inspector that this will speed up the luggage check.
WE also pack snacks in ziplock bags and clear rubbermaid containers, no problems with this at all.
Bev