Arizona Attorney General Mark Brnovich says officials are not allowed to use public resources to campaign for or against ballot measures.
The revised opinion issued Thursday replaces one issued in May but yanked after it was criticized. It said officials could "educate" the public about ballot measures but can't urge that people vote in a particular matter.
The original opinion was requested by Maricopa and Yavapai County prosecutors who oppose a marijuana legalization proposal.
Critics said officials might view the opinion as opening the door for them to seek to change the outcome of elections by influencing voters.
The new opinion outlines a two-part legal test to determine if campaigning by public officials is allowed. It is designed to balance their free speech rights with bans electioneering using public money.