A taxi driver who was about to take children to school has been arrested after testing positive for cannabis.
The 41-year-old man was arrested on suspicion of driving under the influence of drugs on Thursday.
North Wales Police was carrying out an operation involving school buses and taxis in and around Caernarfon, Gwynedd, when the driver was stopped.
He was about to collect children in Llanrug to take them to school in Bangor, but had not moved his vehicle.
Police said the man had been released on bail and Gwynedd council had been informed.