There are systems available that can make it almost impossible for a person under the influence to drive a motor vehicle.
Last year a group of us hired a mini bus (14 seater) and driver in Turkey. That bus was fitted with a trip computer that the driver had to insert his license into every time he started the motor.Take the license out, the motor would stop. The computer recorded the length of time he drove, the speed,the distance, etc., even the license number.If you inserted a license without the correct endorsement, the number was recorded but the bus wouldn't start.
So how simple would it be to have this sort of system amalgamated with a breath alcohol interlock fitted to every vehicle ?
How would this work?
If a ''p" plater inserts his license the computer registers this and the "p" plater has to blow "0" in interlock, if any alcohol is detected the car is automatically disabled for 30 minutes.
If a full license is inserted the same thing would happen, but the limit would be .05.
The license holders DNA would be recorded in the license chip which would have to correlate to the interlock system (yeah I know, "big brother")
If this sort of system was implemented the cost each unit would be minimal due to the scale of the operation.
And yes there will always be some smart arse that can circumvent the system, but when they are at .15 or higher they probably can't work that out anyway
That's my 2 cents worth