Regina is used to getting her way. Though why would she counsel David to get a lawyer? I didn’t get that. I actually think it is funny how scared people are of Regina.
Also i think a police officer can question you without reading you your rights. They do it all the time before they arrest people. You don’t have to talk to them though so nothing Emma did there was wrong. The police do that all the time. They ask people to come down and talk to them without reading them their rights because they are not under arrest.