This guy was homeless (James Boyd) not a recreational user, but still shows the dangers when confronted by law enforcement in a nice area as darkness falls (the Foothills Open Space is between the very nice suburbs of Albuquerque for day-use hiking/running/mountain biking and the Sandia National Forest where backpacking is allowed).
Warning: Graphic video for violence, some blood on a stone
Knowing the area well, I'm guessing a homeowner or passerby saw Boyd's camp and called the police, resulting in a 3-hr argument that devolved into shooting. Moral of the story is not to grab your stuff if confronted by the police (Ok, make sure the officers see your open hands too).
Another problem is the trigger-happiness of the police and not just by the increased militarization. Over 20 years ago (1991), I was jogging on a trail just outside the city limits. Coming down a trail in high sunlight, I saw 3 figures and, getting closer, made out there were two policemen cuffing a Hispanic male. Just as I made out they were police officers, one drew out his pistol and pointed it at me. I quickly put my hands up but with a fluorescent yellow-green T-shirt (ironically to make me visible to shooters - I was not in "open space"), I think they realized I was just a passerby and not a member of whatever gang. After that I joined the military and exclusively jogged on military bases (mostly practice for physical fitness tests) but never really felt comfortable trail-running or even day hiking near cities unless on a very established trail. 1991.
I also brought this up as I tried recreating AmyL's loop north of San Francisco a bit over a week ago (had to use some airline miles). Going towards Mt. Tam, I developed a painful callous on my left foot and had to retrace/detour into very pricey Mill Valley, CA for callous ring bandages and salicylic acid in the late PM (right before Daylight Savings Time). The map I had was old and the trail was rerouted passed unfenced back yards of very expensive homes (it was signed). Guess there's plenty of night walkers with headlamps, so no problems with the police but the trail started veering away from the road towards the pharmacy. I ended up in a wetland between a school and .. who knows. Made it to the road, got my foot taken care of, spent the morning in Sausalito (coffee,bay, maps and bus routes), and took a detour to make up for the lost time (had a free plane to catch), ... but it could have been complicated had the police been called.
So as summer 2014 (and questions of stealth camping pop up), I'm guessing expensive looking trail running gear might mitigate a lot of this if someone calls law enforcement on you.