Interesting and refreshing comment about mission creep. (If you haven't read the whole thing yet, Sir_Good_Day is the former screener who is answering folks' questions in the comments section.)
How did you deal with any drugs you found?
What did they tell you about the 3-1-1 bags? Did you give people a hard time for having too many liquids or for leaving some in their luggage? What are you really checking for there?
Sir_Good_Day: I saw pot. I totally ignored it. We weren't worried about liquids then. That was after I left that was an issue.