[GOPJ]

...the word ‘incidental’ here as a technical term- not to mean “by accident”

Ahhh, THAT clears up an easy misunderstanding... thanks Mr.K.

[Liz]

One post described “incidental” thusly:

If the target of the surveillance has phone conversations w/ others NOT being surveilled, the latter are considered “incidental” ....... persons that may often reveal info that is pertinent to the surveillance issue.