I found some more details, maybe Bruce isn't a drunk skunk at all. The story is that he was riding his motorcycle in the park, some fans spotted him, he pulled over, they took some pics, then someone offered him a shot or two of tequila which he drank while sitting on the bike. This was in view of park rangers. When he rode off, they stopped him. The arrest report says he failed eye tests, failed the walk test by going way past the instructed X number of tests, was wobbling when doing the eye test, initially refused the breathalyzer. But when he did take the test, he blew .02. What is unknown is the timing, like was it hours later when he finally took it? If it was near the time he was pulled over, then I don't see how he could be drunk.
Also, there is another angle here that the media hasn't brought up. And that is that in the Gateway National Recreation area alcohol was allowed, up until just a few years ago. It's possible Bruce didn't know that it was no longer illegal. But in any case, I sure wouldn't be taking shots while sitting on a bike in public and for damn sure not in view of park rangers. With the .02 reading, unless that was hours later, I don't know why the rangers would have arrested him. The arrest report also said that he was cooperative, so that's not an issue. Seems like it should have been a ticket for alcohol, at most.