I would like to comment on the manifestation of intoxication. In fact, what my colleague is speaking about is tolerance. When people are dependent on alcohol, they have developed tolerance. As a result, they do not look drunk. However, when you look at the reflexes of these people, they're a really big danger on the road because of their reaction time.
What we're speaking about on the road is the following. If there's a threat on the road, one needs to be able to integrate many decisions at the same time. For instance, there's a car coming and it's threatening me. Do I need to accelerate, go in the ditch, put the brakes on, or do whatever? That involves complex decisions for the brain. Being drunk is exactly that. Those people who have no outside sign of intoxication are incapable of that complex process.
On the other hand, I would like to remind the committee that a young drinker may in fact experience drunkenness, because when the blood alcohol level is increasing, you feel drunk, but in fact the reflexes are still there. That's important to understand. They look drunk, but if you test them on perception or on reaction time, they're not as bad. So in fact they're not as dangerous, even though they will look more drunk.
On the other hand--and I remind you if you're drinkers--when the blood alcohol level goes down, at the end of a party, for example, you don't feel drunk. You feel as if you weren't. But then you're in danger, because if you are tested, the BAC will be high. And if you're tested on reaction time, which is the key thing on the roads in having the behaviour that will prevent an accident, you will not be good.
So our subjective experience is treacherous.