+1, and something else to remember here in the U.S.:

Despite what you see on TV every day, the police cannot take you into the station for "questioning." You can refuse. If they do take you, you are then under arrest, whether they "book" you or not. You must now recognize that you are under arrest: See The Sock's advice and call an attorney.

Also, it is permissible, legal and done all the time for the police to lie to you during any questioning, trying to get you confused, worried and/or trap you into saying something you should not have said. If you are going to be questioned, have your attorney present. If he is not there, see The Sock's advice.

In terms of preparation, IMO you should have the name and number of a reliable attorney available, even if he is not doing criminal law: he will know someone who does. In the meantime, he can protect your rights.