Of course, there's always the "stayed overnight" rule. I know of plenty of Witness women who spent the night with a friend sitting outside their ex-husband's home, so they could testify that he spent the whole night with a woman. I don't consider them aggressors or spies... I consider them victims of the Watchtower's ridiculous rules.
A sweet 60 year old sister in my congregation was forced to do this in order to divorce her unbelieving, abusive mate. Forcing people to resort to this demeaning, and possible illegal action is sickening beyond belief.
Sorry it's not about elder spying, but I just had to say this. This sister's case has been dragging on for several years. i want to bite nails everytime I think about it!!
Kat