There is a lot of BLM and private land mixed together, and very few fences. The Cattlemen's Association has banded together, and if you plan on hunting these areas, you need their "permission". So far this piece of paper has been free. You can enter this area via BLM roads but once you're out there, you don't really know if you're on BLM, Railroad, private, etc. It's becoming a rat race, but unless you want to take a chance on being hassled, you better pick one up. It's apparently all legal, because they are doing it. I haven't seen anyone, but have talked to people that have seen entrance roads with check points. A large chunk north of the freeway and south of the railroad tracks used to be open to hunting. Not any more. Some years ago they stretched cable across access roads and posted it No Trespassing. Most of that area is probably private, but it all looks just like the rest of the unit. I've talked to Fish and Game, when hunting out there, and as of a few years ago, at least that officer wasn't checking for or enforcing it. I've spent many, many, days, and nights out there, both in and out of season. I don't like it, but will do what I need to, to be able to go out there as long as possible.
