What must be present for there to be a valid waiver of the Miranda warnings? What is meant by "in custody" for the purpose of Miranda? May a suspect waive their Miranda rights and speak to the police even if they have an attorney? May the warnings given by the police vary from the language of the Miranda decision? What crimes require the Miranda warnings? Do they need to be given at ordinary traffic stops? Why or why not? Are there circumstances other than an actual arrest where the Miranda warnings must be given? Are the warnings required when the police question witnesses? Are they required when gathering preliminary information from a suspect? What must be present for a waiver of Miranda to show that the statement is made of the suspects own free will? Are the warnings required when an undercover officer questions a suspect