" The fornication stakeout guys " are a JOKE ! but they strike lucky some times , from their point of view, or someone copying the technique does.
I knew a young guy whose marriage had ended in reality, his wife wanted a divorce so she could marry a very rich guy about 10 years younger than her.
She followed her husband to his new girlfriend's house, stayed all night, taking pics. of him entering and leaving, Bingo ! she had her proof !
He was duly DF'd, but he told me he didn't give a shit anyway, but he also told me that "fornication" did not take place that night, or before, he slept in a spare room, he only stayed because he had drunk too much to drive.
But according to the J.W "Rule Book" just staying the night is enough " Where da fluck is THAT in Scripture ??