The 5th Amendment protects the innocent more than the guilty.
Because of the SCOTUS ruling in Salinas v. Texas, you are now expected to know that you have a right against self-incrimination, and unless you specifically and clearly invoke this right, anything you say or do not say, including your mannerisms at the time you stop talking, can be used against you. You actually have to say, “I do not answer questions.”
Don’t concern yourself with what kind of interrogation you’re in. Don’t worry about whether Salinas applies in your particular situation. Just invoke your 5th Amendment right immediately, verbally, and clearly. source