My Lords, I rise to oppose Amendment 157 and speak to Amendment 164 in my name and that of the noble Lord, Lord Brooke of Alverthorpe. I am currently drinking only small amounts of alcohol, so I have no personal interest in this matter.
I have listened carefully to the arguments in support of Amendment 157, but I still do not believe it will have the effect desired. I think that all noble Lords in the Committee will agree that any consumption of alcohol will lead to a deterioration in driving standards and increase the risk of an accident. The noble Lord, Lord Brooke, asked where the current limit comes from. The Grand Rapids study of 1964 showed that the risk of having an accident rapidly increased at a blood alcohol concentration—BAC—of 80 milligrams per 100 millilitres of blood or the equivalent. That is why our current limit is set at that level, and I think that is the correct level.
My understanding is that compliant drivers feel uncomfortable driving with a BAC of more than 30 milligrams. My feeling is that the majority of drivers adhere strictly to a limit of 50 milligrams in any case, and when they are caught driving at more than 80 milligrams, it is often a stupid, but criminal, mistake which can arise for a variety of reasons which I will not weary the Committee with. The evidence for this contention is that when the 50-milligram limit was introduced in Scotland, the initial compliance improved by only 12% and I suggest that when a contravention occurred and was detected, it was often the kind of “mistake” I referred to. In this country, we rightly have severe penalties for exceeding the current limit; it is also socially unacceptable. Other countries, as observed by noble Lords, have a limit of 50, but without the severe penalties, at that BAC, that we have.
After the Scottish Government lowered their BAC limit, the noble Lord, Lord Brooke, and I were very keen to see the data, but, I suspect, for slightly different reasons. I was worried that I might be wrong. If that had turned out to be case, I would be supporting Amendment 157. The Scottish Government commissioned research to measure the effect of their changes to the BAC limit. The conclusions were that the change made no detectable difference to the accident rate in Scotland. I never expected it to, and I will explain why in a moment. The Committee will have been grateful for the frankness of the noble Lord, Lord Brooke, when he touched on this point.
The proponents of Amendment 157 will have to explain to the Committee why they think the results in England and Wales would be any different from those in Scotland. According to 2019 DfT statistics, of a sample size of 243 dead drivers, 34% had a BAC of 10 or more, so had been drinking, 25% had a BAC of 51 or more, 23% of 81 or more, 22% of 101 or more, 16% of 151 or more, and 5% were at 200. What these figures show is that most non-compliant drivers are not just slightly over the limit, but far over the limit.
I have argued from the government Dispatch Box that there is a cohort of drivers who are unregulated drinkers. They are clinically dependent upon alcohol, they do not know how much they have been drinking, and they pay absolutely no attention whatever to the legal limits—thus, changing the limit will have no effect on them. The police do not find it very difficult to detect drunk drivers who have made the criminal mistake I have already referred to. They tend to overcompensate and drive too cautiously, and so give themselves away, and thus can be legally stopped by
the police. Unfortunately, an unregulated driver is much more difficult to detect. They will drive fluidly for relatively short distances, and therefore with a lower chance of even being seen by the police, let alone being caught.
As proposed by the noble Lord, Lord Brooke, the only way of dealing with and detecting these very dangerous drivers who are unregulated drinkers is for the police to undertake operations where they stop every driver to check that they have not been drinking. I accept that the amendment might not be perfectly drafted, and that some civil rights precautions may have to be put in. However, not only would the police detect more of these very dangerous drivers but the deterrent effect would be considerable. Although it may be imperfect, Amendment 164 achieves this.