Title Two: Fundamental Rights, Citizenship and Social Goals
Chapter One: Fundamental Rights
Art. 29 General procedural guarantees
3 Any person who does not have sufficient means has the right to free legal advice and assistance unless their case appears to have no prospect of success. If it is necessary in order to safeguard their rights, they also have the right to free legal representation in court.
Rights during trial - legal assistance
Legal Aid
Rights during investigation - legal assistance
EDIT.