What is Elvis Cole hired to do in the Teddy Martin case?

Green hires Cole to look into Officer Angela Rossi, who is accused of police misconduct in a previous case. Green establishes a tip line to bring in information about the murder of Susan Martin and several callers allege that Rossi is a dirty cop. Green tells Elvis about the LeCederick Earle case a few years back. Earle says that Rossi planted evidence in his home. Green believes that Rossi, who found the murder weapon, may have also fabricated evidence to frame Teddy Martin for his wife's murder.