If you are a non U.S. citizen and you are stopped in your car by a police officer or an immigration official, you should first make sure you stop the vehicle in a safe place, but as quickly as you can. Officials with the Tennessee Highway Patrol work with the federal authorities when it comes to enforcing immigration law.
Open the window only part way and make sure your hands are where the authorities can see them, such as on the steering wheel. Hand over the relevant documentation they ask for but if they ask to search the vehicle you can refuse, however, if they think the vehicle contains criminal evidence they can search it even if you say no.
If you are questioned about your immigration status you do not have to answer any questions about your place of birth, how and when you entered the United States nor whether or not you are a U.S. citizen. However, you must show your immigration papers if an immigration agent asks to see them. If you have no papers, say you want to remain silent.
If the immigration agents come to your home, you do not have to allow them to enter unless they have the right sort of warrant, one for arrest, or search, or removal and deportation. If the latter they cannot enter your home without your consent. Ask to see the warrant before you open the door. Even if they have a warrant you still do not have to answer any questions, but should you waive the right to silence, go outside your home to speak to the agents and close the door behind you.
Remember, only discuss your immigration status with your lawyer and do not answer questions and sign nothing until you have spoken to him or her.