I'm not sure if it was any kind of official rule, but I worked at times in a JTAC capacity for troops in contact. I mention the last bit because it's very high stakes where seconds and minutes count a great deal more than when you do coordinated tactical strikes against strategic objectives like weapons caches. When I did that kind of work we had to have three eyes-on forms of contact. Often that was the calling troops, the observer (like an Air officer), and an air asset like a drone. They all had to independently describe the target, its orientation, and surrounding activity.

However you sourced your target is irrelevant to the activity at hand. When I first heard of this news I knew immediately someone skipped target verification or that it was simply no longer a policy of the DOD.