The most important thing is to remember to stay calm, and know what your basic rights are. We kind of talked about it before, but your basic rights are this: you do not have to answer any questions you do not want to, you do not have to consent to anything you do not want to, and know this, if you do not know what you are able or allowed to do, ask for a lawyer. At that point, if you’re in custody in a situation where a lawyer can be provided for you, they have to allow you a chance to contact a lawyer, and then the unknowns you had in your mind can at least be resolved by talking to someone who’s trained in the law to help, protect and defend you.