Do Androids Dream of Electric Sheep?

Why does Rick let Rachael Rosen go?

I think the main reason that Rick lets Rachael goes is because he has feeling for her. They both seem stunned at first when Rick arrives to The Rosen Co. Plat form. At first Rachael seems to believe that it is not him that has exited the hoover car. After going through all the the animals and stories that they have to tell him he decides that it is time to start the testing. His first test is administered on Rachael. In the end he finds out that she is an android and that she has the new nexus-brain. He feels some kind of empathy for her because he does not retire her, so that tells me that he has feelings for her. Later in the novel, Rick gets a call from Rachael saying that she wants to help him find the other androids because she think she would be help because she is one of them and has there brains. Another reason could also be that he sees in the end that the Rosen have something on him because at first he was not sure that Rachael was a android of not, but he also might think in the end they might be able to help him in need if something is to go wrong.