I live in the state of Iowa. My 20 year old son received a phone call from a police detective today, the 13 of July. He told him there was a complaint filed against him by a 19 year old man for threatening him with a knife. My son did go to speak with this person, but he did not have a knife. The man filing the complaint has been threatening my son's girlfriend (also the complaintant's ex- girlfriend) with bodily harm, and my son went to tell him to leave her alone. She had contacted the police, but they told her there was nothing they could do without proof. He is supposed to talk to the detective tomorrow (July 14), and I need to know if we should have an attorney present at the questioning. As far as I know, no charges have been filed. Also, can my son decline to be questioned, or to even go to the police station? This man also came at my son with a baseball bat. Can he file a complaint, too? I urgently need an answer!