mook jong man
Senior Master
It's not the intent of catching criminals, it's the illogic of it.
"If you're breaking the law, please stop here and identify yourself so we can prosecute you."
It's like expecting a mugger to see the "No Guns" sign and think "Oh crap, I better go put my gun in the car before I hold up that crossing guard."
They don't have to say " Guess what I'm a rock spider " for them to be stopped.
If the border protection think you look a bit dodgy they can start going through your laptop and phone.
If you've just got some home movies of you and the missus on there doing some horizontal folk dancing then you've got nothing to worry about.
But if you've got something more sinister on there , then you will be going to the big house where you can have plenty of sex , whether you want it or not.