person of interest
n.— «To signify this, law enforcement officers describe these go-to folks as “persons of interest.” But White correctly notes that in the public eye, “person of interest” has become a euphemism for “suspect.” The phrase, he says, carries a connotation of guilt.» —“Editorial: Bouquets & brickbats” Albuquerque Tribune (Ariz.) Mar. 16, 2005. (source: Double-Tongued Dictionary)