Neighbor Is Dui. Is It Worth Reporting Or Filming It?

Not sure if this is the right place to post, but it's as the title says. My nextdoor neighbor is some sort of alcoholic and/or drug addict. I see him in the morning when taking my dog out early in the morning driving clearly heavily under the infuence. He has a history of aggression and paranoia, so I don't want to agitate him and make myself a target in any way, but it is hard to see this. I mean, heaven forbid he hits one of the many children at the bus stop -- he drove in maybe 15 minutes after the bus came by this morning.

What are my options? Can I anonymously report it to the police or request some extra morning patrols by the bus stop and just hope the police catch him in the act? Or would I need to file some official report if I tried to do that, with my name attached to it? Is it worth filming for evidence? I want him to be stopped but I worry about retaliation if he found out I reported him.

I live in MD, USA. TIA.