The SPCA folks are acting as animal control in many counties.
This section comprises Kansas' farm animal and field crop and research facilities protection act. Under the act, no person shall, without the effective consent of the owner and with the intent to damage the enterprise conducted at the animal facility, damage or destroy an animal facility or any animal or property in or on an animal facility. A person is also prohibited from exercising control over an animal or property. The act makes it illegal for a person to enter an animal facility that is not open to the public to take pictures or video. Violation is a nonperson felony if the property damage is $25,000 or more. Illegal entry that involves taking of pictures or video is a class A, nonperson misdemeanor.
No mention of a shotgun, but I suspect that such folks would at least see one.