It is in fact a normal procedure when it is known that the person has weapons and that he is at risk of being suicidal.
I'll give you the example of people who work in suicide prevention in Quebec. When they meet with a client, they ask if he or she has firearms at home and if he has access to means to commit suicide. That is one of the first questions they ask. Firearms are a very lethal means of committing suicide. So workers take the time to check on that specifically. If the person says yes, he is asked to relinquish his firearms voluntarily. He is asked whether he is in agreement that his weapons be removed. Generally, people agree. If they refuse, then a report is made to authorities.