POLICE saw a vehicle moving in an "unusually slow manner" at Broad Road near Limavady and a driving whilst unfit offence was then detected.
John Boyle (50), of Drumard Park in Derry/Londonderry, pleaded guilty to the offence which happened on July 31 last year.
A prosecutor told Limavady Magistrates Court, sitting in Ballymena on Wednesday, around 9pm police received a report of a driver suspected to be under the influence.
Police saw the vehicle passing and they followed.
They noticed it driving well below the speed limit in an "unusually slow manner".
It was braking on straight sections of road and swerved several times across the centre line and had had almost driven "off the road".
The vehicle was stopped and the defendant's eyes were glazed and his speech was slurred.
Officers had difficulty understanding what he was saying.
He was unsteady on his feet and appeared "completely confused" as to why he was stopped and "what was going on".
There was no smell of alcohol.
A blood sample found substances including cocaine and prescription medication.
A defence lawyer said the defendant "simply does not remember the incident".
The court heard the defendant had been banned from driving at the same court in April this year for a similar offence.
At Wednesday's Court Boyle was banned from driving for 18 months and fined £300.