Fundamental rights as limits in the framework of private investigation

The purpose of this work is the analysis of the information obtained by private investigation agents; that is, private detectives, who are authorized by law to practice this profession. It analyses how such an investigation can be carried out, how it must be obtained, and, ultimately, what scope it can have; that is, what the consequences can be, and what evidential value their reports can have in the framework of a process. All this with the purpose of framing the private investigation in the demands derived from the constitutional text of respect of the fundamental rights, starting from its effectiveness so much vertical, as horizontal; taking into account that the action of the detectives, more and more demanded, affects rights that are nuclear, notably, the protection of the domicile, the secret of the communications, as well as the rights to the honour, to the intimacy, to the own image, and data protection.