Police in New Jersey must explain the state's implied consent law to motorists in a language that they understand.
The state Supreme Court on Monday overturned a conviction for refusing to take an alcohol breath test because the man, who spoke only Spanish, did not understand the consequences.
The court says a Plainfield police officer failed to inform German Marquez in Spanish that he would lose his license if he refused the test.
Police had responded to a two-car accident in 2007. The officer initially asked in English for Marquez to show his license. The officer then repeated the request in Spanish.
He said he didn't understand what police were reading to him and that he had taken his driver's license exam in Spanish.