In Arizona we are not required to inform an Officer when stopped for a traffic violation unless he asks.

My wife was stopped a few months ago for a minor infraction and as a courtesy to the Officer she volunteered the information that she had a CCW and was carrying. He went from being a semi-nice guy to accusing her of putting him in danger by carrying a gun. He retrieved her M&P from her purse, cleared the chamber and emptied the magazine and took everything to his car where he ran her information and the serial number on her gun. When he returned the cartridges were in a small plastic bag. He had her open the trunk and placed everything in the trunk and told her not to open it until she got home. From now on we both will abide by Arizona law and not volunteer any information about carrying a gun unless specifically asked by the Officer. He treated her like very badly and her attitude towards Police Officers took a serious downturn.