Most of the time they may have policies, but no one follows them.It really depends. My daughter Abbey had a job at Petsmart for a time and was trained in pet care. I was surprised at how much she learned and how accurate it was. So I think it depends on the particular store, policies, and the working individuals. Not to mention the quality of fish they get from their suppliers.
Also, think of it like this...with all their education and training some doctors are top notch and then there are quacks!