In Indiana, an undercover police officer can not make a stop merely for a traffic violation.
§ IC 9-30-2-2 – Uniform and badge; marked police vehicle
A law enforcement officer may not arrest or issue a traffic information and summons to a person for a violation of an Indiana law regulating the use and operation of a motor vehicle on an Indiana highway or an ordinance of a city or town regulating the use and operation of a motor vehicle on an Indiana highway unless at the time of the arrest the officer is:
(1) wearing a distinctive uniform and a badge of authority; or
(2) operating a motor vehicle that is clearly marked as a police vehicle;
that will clearly show the officer or the officer’s vehicle to casual observations to be an officer or a police vehicle. This section does not apply to an officer making an arrest when there is a uniformed officer present at the time of the arrest.
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