OK , so long story short but myself and a few others attended a sporting event at the weekend like most weekends, a family member of my partner turned up and drove home after drinking all day, not that it makes a difference but he didnt just drive down the road, the journey back was 3 HOURS AWAY, featuring about 3 different motorways, my partner and i are horrified, he was that wasted it took him a hour to find his car, i couldn't stop him at the time as I was already on a coach home at this point ( a coach that was about £20 for a return journey.... yeah I know ), but when I heard this my anxiety just leapt up, HE COULD HAVE KILLED SOMEONE and it will be on my conscience for the rest of my life if he did, he is not the kind of person you can talk to as in his eyes he will be doing nothin wrong, to be honest my partner and I are not massively keen on the bloke anyways, I understand he is coming to another sporting event this weekend that is about 2-2.5 hours away, if he is to do the same again , what should i do ? call the police as in 999, Will they care and will they be able to do anything as its a long distant journey, and would it be dealt with in a way that wont suggest I've called myself? any advice appreciated, not been dramatic but I have been crying all weekend over this, I appreciate drink driving wasn't so much an issue when said person passed test however there is such a large volume of traffic on the roads these days, and motorways are barely lit, just why would you do it?