@Todd ********
As in, specifically told that they had stayed too long on tourist entries.
When I say deemed to have stayed too long, I mean stayed too many months on tourist stays. If you are denied at the airport, they may give you the option of going back to wherever you came from or to another neighbouring country.
However, they *can* also direct you to go back to your passport country - and they can put you in the holding cell until you do. All depends on how lucky/unlucky you get, but *generally*, if it does get to that stage, they will likely have given you at least one previous warning and made a record of it ("This time OK, next time get visa").
However, some people don't take the warning/s seriously and end up regretting it.