[MJT]

Originally Posted by wisref2

Here's what I teach at our local association:
Beanbag all fumbles, including those behind the line.
There is no need to beanbag behind the line, but:
It tells everyone, including your crew, that there is a fumble.
It keeps you in the habit of beanbagging fumbles so you don't have to think about it.
It prevents you from having to decide if it is behind the line.

This what we do as well and why.