No, in Germany the police do not have the right to detain you without telling you the reason, especially for long periods.
Basic rules of detention:
When you are detained, the police must inform you immediately and clearly of the reason for the detention.
Temporary custody (Gewahrsam) usually does not exceed 24 hours, and it can be extended to 48 hours only by order of the public prosecutor’s office.
After this period ends, you must either be released or brought before a judge to decide whether detention should continue.
Rights of a detained person:
The right to know the reason for detention.
The right to contact a lawyer.
The right to inform a family member or a trusted person about your detention.
Long-term detention:
Detention for long periods without a court order is not allowed.
Any detention that exceeds the legal time limits must be subject to judicial review.
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