To me plagerism is a very serious deal. Rather your in school or the work place you should always give credit where credit is due. I havent personally been a victim of plagerism and if it ever happened im not sure on how i would handle it. I do know if it happened at school i would contact my academic advisor and professor and have them handle it. If it was at work i probally would confront them and if that didnt work i would contact the supervisor. Citation is very professional and a must have in soceity.