Breathalyser tests

Freedom of Information (FOI) Act request ref: 01/FIN/25/003851/O

Version Date: 13/11/2025

The Performance Analysis Department has provided the following information:

Request 1.
The total number of motorists of all categories that were arrested by the police force between December 1, 2024 and January 5, 2025, after failing an alcohol breathalyser test.

If possible, please break down by time of day when the motorist was stopped by police and asked to take the test.

12 pm-6 am
6.01 am-11.59 am
Total stopped

Request 2.
The number of failed breathalyser tests in the following ranges (as measured in mg of alcohol per 100 millilitres of breath)
Between 35 mg and 70 mg
Between 70 mg and 105 mg
Between 105 mg and 140 mg
Above 140 mg

Please note that this is not an evidential reading

Request 3.
The total number of motorists of all categories that were arrested by the police force between December 1, 2024 and January 5, 2025, on suspicion of drug driving.

If possible, please break down by time of day.

12 pm-6 am
6.01 am-11.59 am
Total stopped

Data Processing:
RT88340 - Drive a vehicle whilst unfit through drugs             
RT 88344 - in orange book same as RT 88340           
RT 88348 in charge of a vehicle whist unfit through drugs               
"RT88527 - Cause death by driving without due care / consideration while over prescribed limit- specified controlled drug
"RT88583 - Cause death by driving without due care / consideration while unfit through drugs
"RT88584 - Drive motor vehicle with a proportion of a specified controlled drug above the specified limit           
RT88585 - In charge of a motor vehicle with proportion of specified controlled drug above specified limit            

Request 4.
The number of motorists who were stopped by the police force between December 1, 2024 and January 5, 2025, who were subsequently charged with
•           A drink-driving offence – 45
•           A drug driving offence – 42
•           A combination of drink and drug driving offences – None