The National Football League (NFL) publishes their Rulebook online and updates it each year. This defines all aspects of gameplay, penalties, and numerous other topics.
One topic I have been interested in is how Officials are supposed to conduct themselves during game play and what guidance they are given from the NFL in carrying out their duties. However, there is not much to go on... the only thing I can find in the Rulebook is
Rule 19. Officials
Section 1 - Officials
Article 4. Responsibilities and Mechanics
Officiating responsibilities and mechanics are specified in the Mechanics Manual, published annually by the National Football League.
I cannot find the referred to "Mechanics Manual" on the NFL Operations website. Is it published publically or only internally by the NFL? If publically, where can I view it or obtain a copy from?