The document discusses transparency in transportation accident investigations in the United States. It notes that the NTSB is the lead independent agency for such investigations and has evolved to emphasize openness. Investigations are open to public participation through various means like public hearings and final reports. The NTSB prioritizes investigations but will relinquish control if a crime is suspected. This balanced approach allows efficient cooperation between safety and law enforcement investigations while maintaining public transparency, credibility, and access to information to support accident prevention.