I think you should tell a nurse that he's got a knife and that you think he may be cutting himself. But I don't think the reason should be that people may find it triggering....that's not the reason the nurses should be informed. It's just not appropriate for him to be sitting in the day room doing this and for them to be blind to it.
On another note is it a big blade? Because we have laws regarding the carrying of knives in public. I'm presuming that it's small though because you stated it was a penknife and usually they're pretty small...but it's a thought to keep in mind if it looks longer than 3 inches.
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