I love questions about Miranda Rights because it is an area where all the attorneys agree and the answer is always different than what the non-lawyer public believes.
Contrary to what most people believe from watching too much television, there is no requirement that the police read someone their "Miranda Rights." And for the police to NOT read them their rights does not make the case magically go away. The only time Miranda Rights matter is when the government wants to use a statement in court: If the statement was made AFTER arrest and DURING interrogation, then Miranda Rights should have been read. Otherwise, Miranda is irrelevant. It's one of those myths people get from watching too much television.