The law that says you must submit to a test for the presence of alcohol or drugs is known as the Implied Consent Law.
Implied consent laws generally require all motorists lawfully arrested for driving under the influence (DUI) to submit to chemical testing for the purpose of determining blood alcohol concentration (BAC). All states have implied consent laws on the books, though the specifics of these laws vary. The way a patient behaves indicates whether or not they give you permission to do something. There is no formal agreement.
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