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Famous "Don't Talk to the Police" lecture: https://youtu.be/d-7o9xYp7eE

In her case had she refused to answer any questions pending an actual arrest, they likely would have arrested her. This is the (famously obnoxious) “Am I being detained?” question. Once you’re placed under arrest you have the right to a state-provided attorney.

It's true in the US. It's not true in some other countries - it's not true in the UK for example.