All the police need to arrest a person is probable cause to believe a suspect has committed a crime. Probable cause is merely an adequate reason based on the facts or events. Police are required to read or give suspects their Miranda warnings only before questioning a suspect. Failing to follow the Miranda rules may cause suspects' statements to be inadmissible in court; the original arrest may still be perfectly legal and valid.

Police are allowed to ask certain questions without reading the Miranda rights, including the following:

• Name
• Address
• Date of birth
• Social Security number
• Other questions necessary to establishing a person's identity

Police can also give alcohol and drug tests without Miranda warnings, but individuals being tested may refuse to answer questions.