I won't let you through with this.
I've heard the sentence in an American TV show. The scene is in a security check point. A man carried something that was suspected to be a bomb, so the security staff said it.
But to my ear, the guy who said the sentence didn't seem to pronounce the word 'with'. It sounds much like:
I won't let you through this.
So, I'm wondering if the 'with' is droppable in spoken?
By the way, the man probably spoke the African American English, but I'm not exactly sure.