What do they put in the bean bags??

[JugglingReferee]

Originally posted by Theisey

Don't just toss it anytime you feel like it! The bag is a tool to help you, know when to use it.

here are some examples, memorize them. Other situations can be found the in officials manual:
(a) mark the spot of first touching on free kicks and scrimmage kicks.
(b) mark the spot where momentum carries a player into the endzone.
(c) bag the OOB spot if you have to follow players into the OOB area.
(d) bag the spot where a srimmage kick ends for PSK purposes.
(e) bag the spot where the runner is if an IW occurs
(f) bag a fumble or spot of a backward pass when these occur beyond the line. These could be an enforcement spot.
(g) bag spot where an A or K player goes OOB on his own.
(h) bag forward progress spot if you have to assist other officials in breaking up late action.

DO NOT bag muffed snaps!

Also, we're from Canada (ref18 and I) and many of those points may not be accurate. For example, (a) would bag possession, not first touching. (b) if momemtun carries a person into the EZ, he gained possession in the EZ, (c) although this is a good use, I've always found that I can keep the spot while turning my body to the player. It's never failed me yet. (e) if we have an IW, we don't need to bag because the play and PP is now PBD, which all officials should know anyways.