If, and this is very rare, you are in a serious accident where injuries or possibly a total loss of yours or anothers vehicle, you might have to go before a Magistrate. This is not common, as Mexico does not want to hinder tourist travel, or generate bad publicity, due to the economic impact tourists generate. However, on occasion, and due to their laws, they might hold you in a Magistrates office until the case is settled. Most Mexican insurance companies, not all, provide legal assistance for this scenario.