TITLE ONE
CHAPTER I
Fundamental rights
Article 16
The Public Prosecution Service may order arrest of the accused, explaining the causes of such decision, only under the following circumstances all together: a) in urgent cases, b) when dealing with serious offence, c) under reasonable risk that the accused could evade the justice and, d) because of the time, place or circumstance, accused cannot be brought before judicial authority.
Rights during investigation - informed of belief that crime has been committed
EDIT.