At present, police can only carry out a breath test if a motorist has been driving erratically, been involved in an accident or has committed another offence while driving.
3 times police CAN lawfully request a breath test
1) when they suspect that the person has consumed alcohol
2) when the person has comitted a moving traffic offence
3) when the person has been involved in a road traffic collision.
the moving traffic offence is a pretty much catch all..as even 1 mph over the speed limit gives the moving traffic offence..and EVERYBODY speeds at some point!
So "random" breath tests arent going to change much...