What are the 9 golden rules to be observe by the investigator upon arrival at the crime?

The nine golden rules for investigators upon arriving at a crime scene include: securing the scene to prevent contamination, assessing the situation for immediate threats, preserving evidence, documenting the scene through photographs and sketches, identifying and interviewing witnesses, maintaining a chain of custody for collected evidence, ensuring proper communication with team members, adhering to legal protocols, and conducting a thorough search for additional evidence. These steps are crucial to ensure the integrity of the investigation and the admissibility of evidence in court.