There are some 17,000 police departments in the United States. They use any of hundreds of different versions of the Miranda warning. These range from a few words to over 400. One reason is that many fall into vulnerable groups who do not always understand written or oral Miranda warnings. These include those who are deaf, do not speak or read English well, juveniles, mentally ill, and or the mentally challenged. The courts have been less than protective of the rights of these groups who may not have understood their Miranda rights.