frank a former assistant prosecutor, decided to move into private practice. As a prosecutor he was involved in anti-trust litigation. Frank prosecuted makers of pesticides for anti-trust violations. Frank has extensive trial experience and is in high demand in the civil litigation field. frank is hired as an associate by AB&C. AB&C represented chemical co. which was prosecuted by franks office many years ago. frank was not directly involved in the litigation against chemical co. Can frank go to work for AB&C without disqaulifying the entire firm? What should AB&C do?