Ok, hopefully I can clear a couple things up. I have worked downtown for nearly 4 years and I go to quite a bit of concerts/events there, and I literally work right up the road from where this is. I have NEVER had a problem with getting robbed or anything even close to that. This is all in a very safe area.
I have also never had a problem with the police when it came to smoking (I have sat and blazed on the lawn at festivals in Hart Plaza mere feet away from the police, this occured even before medical laws were even a thought here). They are mostly there for crowd control and to make sure nobody gets hit by are a car, there are very chill when it comes to a bunch of white kids running around on drugs(see DEMF), they are very much used to seeing it. Generally speaking, detroit cops are have very different attitudes than cops I have encountered in other michigan cities, like where I grew up and where I live now(st clair shores) and where I went to school(ann arbor). Most of them are likely to have seen some seriously real shit. They are not especially worried about you and you sack of bud, they are worried about dudes with guns and murders and other crazy ass shit like that. Where as cops in the smaller suburbs biggest concerns are teenagers partying.