The accuracy of the meters was first investigated by the Office of the Police Complaints Commission.
The Port Moody Police Department then hired an independent forensic scientist to check the department's screening devices and ensure they were properly calibrated.
The investigation showed 14 of the 174 immediate roadside prohibitions issued in 2011 were performed on faulty devices.
The Port Moody Police Department said it has advised the Office of the Superintendent of Motor Vehicles of the 14 invalid tests, which could result in the driving bans being erased from the motorists' driving records.
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