Prosecutor with over 6 years of experience here (including prosecuting a real estate-related fraud case):Setting aside whether or not this is a JUST law (and not to be a keyboard warrior), but I don't imagine the people saying the charges will never stick have ever put anyone in jail and/or defended anyone in a felony case. 

RCW 9A.52.090Criminal trespass—Defenses.In any prosecution under RCW 9A.52.070 and 9A.52.080, it is a defense that:(1) A building involved in an offense under RCW 9A.52.070 was abandoned; or...

So, if you are concerned about the law, Idaho Code §74-120, then I highly recommend checking to see whether there has ever been anyone prosecuted for violating that law (doubtful).

Surveillance of any other use plus their names may lead to a prosecution for something. 

Why is it that the state of Illinois can't prevent/prosecute those people and their "bogus ads" before they rip people off?

Just to give the rest of this story (in case anyone was thinking of trying this) - the guy lost the house and there are people being prosecuted for trying this stunt.From the AP:FLOWER MOUND, Texas (AP) — After paying $16 to file a one-page claim to an empty, $340,000 home in an upscale Dallas suburb, Kenneth Robinson moved in furniture, hung a "No Trespassing" sign in the front window and invited television cameras inside for a tour.He quickly turned into something of a local celebrity, creating a website, http://16dollarhouse.com , where he sold an e-book and offered training sessions for would-be squatters.

If the property is owned by an LLC or Corp then you most likely cant prosecute the eviction in your individual capacity.

I watched the 60 minutes story online again... there are some people who should be prosecuted if the interviews are accurate (and I believe they probably are).

Either way, I have yet to hear of or know of a case where an individual was prosecuted for accepting money from a licnesed RE agent.

For example, if your speech incites a riot, promotes an overthrow of the government, or creates a public danger, you can be prosecuted.