In an operation by police and the Driving and Vehicle Standards Agency (DVSA) a man has been arrested on suspicion of fraud.
This comes after a crackdown on unqualified driving instructors.
The individual was thought to be taking payments in return for training without holding an ADI badge.
Driving school vehicles were stopped and driving instructor accreditations were checked in a series of roadside checks in Bangor.
Investigator Gareth Edwards said the organisation urges all learners to ensure their instructor is qualified to teach by checking they display a valid DVSA badge in their windscreen.
He said: “Learners can also use the free Find a driving instructor service on GOV.UK to see details of their nearest instructors who are approved and registered with the DVSA.
“All approved driving instructors undergo regular assessments of their ability to teach and are also CRB checked.
“Illegal driving instruction is rare but when it happens can potentially be very serious. We investigate all reported cases and work with the police to bring offenders to justice.”
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