Building an ethical business culture

This answer says that the first step to building an ethical business culture is to "to go with your gut when hiring: look for a cultural fit, [Simon Webley, research director at the Institute of Business Ethics in London] said by email. No matter how big the company is, you can find out if a candidate shares your values by grilling him or her during interviews, Webley said." It also recommends 

1. Creating and publicizing  a code of ethics and including ethics training
2. Structure teams so that people are encouraged to work together
3. Lining up your compensation structure with collaboration
4. Act on your values

I have a question: "How effective are interviews at screening ethical people?"

Label: Aligning interests