Your nationality and birthplace
Pursuant to the law, you may withhold information regarding your birthplace, citizenship status and even how you entered the country. However, keep in mind that rules might vary in the case of international airports and borders, and not providing the required information might generate other investigations.
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Your presence in a specific area
When addressed the question “What are you doing in this neighborhood?”, you may choose not to disclose your reasons for being in that area. It can be regarded as a discriminatory question, therefore, it is your right to choose not to answer it. You can simply say “I choose to remain silent”.
On the other hand, if the police officer does express a valid and legal reason for asking you about your presence in the area, it might be recommended to answer their question.
Your travel plans
People might not like being questioned about where they are coming from and where they are going. It might make them feel questioned for no reason. If you do not want to answer this question, you are protected by the law to remain silent. Just inform the police officer in question that you would rather not say anything about this matter. Giving more information than needed oftentimes might lead to more sensitive situations. Try to avoid that, while complying with the law, of course.