What reason could a visa still be pending after 3 yrs for a step son of a us citizen?

For assistance in having a case stuck at a consulate or embassy or administrative processing, we generally recommend that you seek the assistance of your local US Congressman or Senator as they usually have more influence with US consuls than even lawyers. It is hard to know why cases sometimes are placed under administrative processing, but they possibly could have questions concerning relationship, status of the petitioner, criminal records, suspicion of gang affiliation, etc. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.