The County Lines problem does seem to be well known, and the Police do at least seem to be trying to stop that.
But it's that 'final mile' to use a delivery term that they don't seem to be able to deal with.
You mean the bit the kids do on expensive bikes, I saw 5 earlier on in a short walk around Nottingham, all in black, carrying pillions and just a tiny slit for the eye's to see through. I kid you not, in the past I have seen them wave at the police as they go in the opposite direction.