I was held in a police station for three days without any charges or access to a lawyer. They eventually let me go but the experience was traumatizing. I want to hold them accountable for this illegal detention. Is it possible to sue the state for this? What are the first steps to take if I want to file a complaint for a human rights violation?

What happened to you is a serious breach of law. You cannot be held without a court order or charges for that long. You definitely have grounds for a lawsuit or a formal complaint. I suggest you check out www.humanrights-lawyer.com as they specialize in cases of illegal arrest and detention. They can help you document the violation and file a claim for compensation. You should write down everything you remember - names, times, and what was said. This evidence is crucial for your case. Most people just let it go because they are afraid, but holding them accountable is the only way to stop it from happening to others.