[kossae]

I’ve always been curious as to what “psychological training” would consist of to prepare for seeing such explicit content day in and day out. Perhaps something similar to military/war psychological practices?

[whb07]

Even in the military there is no such thing as this type of training.

source: was infantry.

[jaclaz]

Not exactly what you asked for, but similar enough:

https://www.forensicfocus.com/Forums/viewtopic/t=2329/

More than "training" it is "assistance" and "psychological support".