Angela Williams, Assistant Chief Constable at West Yorkshire Police, tweeted to say that the force had seized more illegal drugs than ever before.
She said: "With our drugs expert Jamie at Leeds Fest watching various drugs that have been seized, being tested.
"A record year this year for the seizure of illegal drugs-the dogs are working flat out.
"Don’t risk your health or your future please."
They were pulled over at junction 26 of the motorway near Bradford on Sunday morning and the driver was found to have no insurance and and no driving license.