Apparently, taking this picture of move star Katherine Heigl (see below) was legal.

- Cow cover-up: Bill undermines confidence in farms - Salt Lake Tribune Editorial

Well, what do you know? The Utah House of Representatives has discovered a constitutional right to privacy.
For farm animals.
The House Friday passed and sent to the Senate HB187, a bill that would create a crime called “agricultural operation interference,” and make violation of said statute a class A or, depending on the circumstances, a class B misdemeanor.
What’s particularly troubling about the bill is that it defines “interference” as only one thing: taking an unauthorized photo, video or audio recording of a ranch, farm, chicken coop, etc.
It’s curious that only those activities, not anything that normal people would think of as interference, like theft or sabotage, would be prohibited by this law. It cannot help but raise suspicion that some operators of some agricultural operations may be doing something that they don’t want their neighbors, their customers or various law enforcement or regulatory agencies to know about. ...

- HB 187: Drive that tractor on through - Provo Daily Herald Editorial

... "Interference" in plain English is when something gets in the way of something else. For instance, an observer of an arrest is not interfering with a police officer by passively standing on the sidewalk across the street. In the same way, neither the taking of a photo or the making of a sound recording of an agricultural operation constitutes interference with anything.
Blocking a road would interfere with the lawful movement of vehicles. Spiking a Redwood tree would interfere with lawful harvesting. Those are acts that are in themselves disruptive. Taking a picture? No. ...

And, hey, there's a movie star on our side. So there.

- Katherine Heigl Urges Members of Utah Senate to Vote Against 'Ag Gag' Bill - Ace Showbiz

Katherine Heigl proves that she is a true animal lover. After Utah lawmakers proposed an "ag gag" bill that would criminalize filming on factory farm, the former "Grey's Anatomy" star sent a letter to every member of the Utah Senate on PETA's behalf in an attempt to persuade them to vote against House Bill (H.B.) 187. ...