:(Just looked up this case, in which the ex-US Marine Sergeant was arrested by Mexican police when he accidentally (it appears) crossed the border from the United States carrying a number of guns - legal in the US but not in Mexico, and remains detained in a Mexican prison awaiting proceedings.
I have great sympathy for Sgt. Tahmooressi. It would be easy to say that the Mexican police would have saved everyone a lot of trouble by simply escorting him back to the border, and sending him and his guns on their way. However, given the difficulties with drug smuggling and general violence in the border area between Mexico and the US, I suppose it is not surprising that they would be very suspicious of anyone found on their patch carrying what were, for them, illegal firearms.
With respect to those who regard the mess into which he has fallen as “bureaucratic”, I have a feeling that it is not that simple. I have no particular knowledge of the Mexican legal system, but I imagine that it is modeled largely on the Civil/Roman law system of Spain. This is also the system followed by most European countries, the exceptions being the United Kingdom, and Ireland and, to an extent, Malta and Cyprus. On the criminal side, this system is inquisitorial rather than the adversarial model followed by Common Law countries (including the US). Persons accused of serious crimes are routinely remanded in custody (or simply detained) pending the completion of an investigation by an Examining Magistrate or a State Prosecutor. This can take weeks, months or (not unusually) years. Even in Europe, cases frequently occur where a citizen of one country is detained for lengthy periods pending the preparation of a report by an Examining Magistrate, a situation by and large accepted in the Continental Civil Law countries. Problems do arise from time to time when a citizen, or a person connected with a citizen of a Common Law country is detained, apparently on pretty flimsy evidence, and is held on remand for very lengthy periods pending completion of the preliminary investigation. The Diplomatic services of European countries will, usually, provide consular support for one of their citizens caught in this plight, but are very wary about challenging the judicial norms of the arresting country. Likewise, the local courts are generally impervious to pressure to accelerate their procedures coming from abroad. I would guess that this is the predicament in which Mr Tahmooressi.
Raw political pressure on the Mexican authorities may help Mr. Tahmooressi. It may, for example, keep his case in the face of the Mexican authorities, and help ensure that he is treated well in captivity. However, European examples do not suggest that it will much advance his release or trial. I hope I am wrong - for myself, the practice of lengthy pre-indictment detention to facilitate a preliminary investigation, typical of the Civil Law system is something of an affront to justice. However, it is the way things are done in Civil Law countries, and local judiciaries are understandably reluctant to yield to foreign challenges to what is a fundamental and long-established of their procedure in dealing with persons charged with serious crime.
I hope that this matter is resolved soon - but it would be too much to say that I am optimistic. Best regards, JR.