ILLEGAL tippers were targeted in a sting operation at Milnsbridge.
More than 70 vans and trucks were pulled over in Manchester Road on Wednesday.
Officials from Kirklees Council and the Environment Agency found 15 drivers did not have the correct papers.
They have now to prove they can legally dispose of waste - or face prosecution.
An agency spokes- man said: "It was a very successful operation.
"The people who could not show our officers the correct documents to prove they could both move and dispose of waste will now have to do so.
"They should carry all this in the vehicle at all times. If it turns out they do not have those documents we will look at the best option.
"That could be prosecution, but we review each case on its merits."