S4·E19 New Blood

Chris is assigned an ambitious detective trainee, Lisa Hann, to help him investigate the murder of Itsy Bitsy Magazine model Shelly Hunter. As they investigate, Chris often finds himself warning Lisa about her negative use of force. Finally, when Lisa physically attacks one of the models--who won't give her the information she wants--Chris tells Lisa he is going to write her up. The next morning, the captain tells Chris that Lisa is suing him and the department for sexual discrimination and harassment. Soon, Chris finds that Donovan has turned on him; he tells Chris to admit to the harassment, and strike a deal. Chris refuses to bargain, and decides to investigate Lisa. Along with Rita's help they may just uncover the truth about Lisa. Meanwhile, Rita is loaned out to vice to work undercover as a prostitute in a sting operation.