As a lawyer, my advice is always to stay as far away from police as possible. Do not volunteer anything. Do not participate. Online, always work under the assumption that you are the target of an investigation. Encrypt everything. Use VPNs, preferably overseas VPNs by default and Tor where necessary. If asked, never speak to any investigator without first talking to an attorney. Do no rely on some lay interpretation of a constitution. That document is not the friend people make it out to be.