You forgot the rest of it:There is more than one variable in that statute.
IC 35-33-1-1.5
Crime involving domestic or family violence; duties of law enforcement officers; confiscation of firearm, ammunition, or deadly weapon
Sec. 1.5. (a) A law enforcement officer responding to the scene of an alleged crime involving domestic or family violence shall use all reasonable means to prevent further violence, including the following:
SNIP
(b) A law enforcement officer may confiscate and remove a firearm, ammunition, or a deadly weapon from the scene if the law enforcement officer has:
(1) probable cause to believe that a crime involving domestic or family violence has occurred;
(2) a reasonable belief that the firearm, ammunition, or deadly weapon:
(A) exposes the victim to an immediate risk of serious bodily injury; or
(B) was an instrumentality of the crime involving domestic or family violence; and
(3) observed the firearm, ammunition, or deadly weapon at the scene during the response.
Doesn't matter if there's PC of a DV crime, doesn't matter if the Officer thinks a gun could endanger the victim, doesn't matter if the Officer thinks a gun was used in the crime. That little word AND means that the Officer MUST have observed the weapon at the scene during the response. Unless the guy had 9 guns on him, or just laying around the house out in the open where they could be observed, then the seizure violates the law.
Now, all that being said, if the guy DID beat his wife, well then, he deserves a nice long stay in a State facility, in which case he won't need his guns....