Which of the following is NOT among the three universal deadly errors?

The correct choice identifies "Not maintaining visibility" as NOT being one of the three universal deadly errors in law enforcement. The three universal deadly errors generally emphasize critical tactical aspects that can lead to officer safety incidents.

Maintaining visibility is vital during law enforcement operations because it allows officers to be aware of their surroundings, anticipate threats, and maintain communication with their partners. While not maintaining visibility is certainly a tactical error, it is not classified as one of the universally recognized deadly errors, which often focus on more immediate and pressing issues that can lead directly to dangerous encounters.

On the other hand, failure to use contact and cover, failure to follow stages of arrest, and not matching tactics with assessment are all tactical errors that can significantly escalate situations and contribute to danger during law enforcement activities. These errors relate more directly to an officer's immediate actions and situational awareness during critical incidents, which aligns closely with the foundational concepts of officer safety and effectiveness in the field.