While the judge is permitted to consider all relevant evidence presented in your case, the types of evidence that will generally be most relevant involve the mental state of the firearm owner in question.  Any statements—whether oral or written, such as on social media—that tend to indicate that a person is considering using his or her firearm to cause harm to others (or himself) will be relevant, as well as simple concerns that the firearm owner is not in a mental state that makes possession of a dangerous firearm advisable.  Essentially, any signal that you have violent intentions can be used to support a judicial order to temporarily confiscate your firearms.