The main difference between the two is that false arrest requires an arrest, but, false imprisonment only requires unlawful detention. Your constitutional rights are violated if you are arrested without probable cause.False arrest refers to arresting or imprisoning someone without a warrant. We bring years of experience to the table in defending false arrest cases in New York City. Our lawyers are well-versed in the nuances of New York laws. If you have been arrested without probable cause, you are entitled to compensation for any damages suffered from a false arrest under Federal and State Laws. If you have been arrested or imprisoned wrongly, contact a law firm that specializes in false arrest immediately. But New York law prohibits the use of evidence that was obtained unlawfully. For example, the police might arrest a person and find illegal drugs on him or her. But see NYPD Response.