I've seen rangers patrolling the roads early in the morning - my guess would be to nab anyone camping illegally off of a day-use trailhead. I'm not sure that they really do anything much about vehicles parked that way, even though the Park's web page states that vehicles parked overnight at trailheads other than backcountry boards is cause for concern: https://www.nps.gov/jotr/planyourvisit/bcboards.htm
There is no fee for camping in the backcountry at Joshua Tree National Park. However, you are required to park and register at a backcountry registration board. An unregistered vehicle or a vehicle left overnight somewhere other than at a backcountry board is a cause for concern about the safety of the vehicle’s occupants. It is also subject to citation and towing.
JT is my favorite National Park. I know it well, and it feels comfortable and friendly to me. Maybe it will claim me someday, if I become too comfortable with it.
Like OtherHand said, Maze Loop is not a feasible parking spot for heading all the way out to Smith Water Canyon. SWC is most easily accessible by driving in on the Covington Flats road, and the Boy Scout backcountry board, the Quail Springs picnic area, or a handful of informal pullouts along the main drag all offer better access than Maze Loop.
The Smith Water ping is really odd. I would like to know more about the configuration of cell towers and their capabilities. It's been many, many moons since I worked with that stuff ( I was a programmer on a system that worked with tracking devices that used cell tower pings, many moons ago ) but getting location from cell pings is not an exact science. Capabilities are no doubt better now that they were in the late 90's, but tower jumps when trying to triangulate a position was one way you could register a ping way off from where the device was located. Still, physics is physics, and for something like the Ewasko ping that gives a hard upper limit on the distance. I just find it odd that two pings from Smith Water have not turned up anything. Not in the Ewasko case, and from what we glean by reading news reports, not in this case either.
I was also thinking about the same thing as you, OtherHand - four missing persons. I first thought about it when Rodriguez went missing - what is it about that area of JT? It is not even all that remote. If you want to get lost in JT, head to the Pinto Basin or the southern parts of the Park. But now we have potentially four people waiting to be found, in this area.
cynthia23 - I found a link to a story describing a woman's skeletal remains found in the Santa Rosas years ago, but it doesn't match the description of your story: http://vault.sierraclub.org/sierra/200901/lost.aspx
I'm not sure what to think about this case. I find the known facts don't quite add up. But I've also seen many things that looked fishy have perfectly normal explanations. And JT is full of nooks and crannies.
I wish the authorities were more cooperative in these cases. I understand the desire to not have the masses tramp all over possible scents, clues or footprints, but I also think that, for example, being open about where searchers have been could help coordinate a greater effort. In the end the goal is to find missing people, right?
