What else was going on during that time? Were they able to move up the food chain and arrest everyone in the operation or additional locations? That's usually why they'd wait.
Yes they found the owner and the other locations he and his wife own as I understand. 8 months though for this operation? They sent an officer in the establishment three times and he each time he was offered ***. So with that knowledge they need cameras in the rooms?
Sound more like a target for high profile johns as it is busting human trafficking. If this were a major crime by the johns I understand, but it is not. It is either continued exploitation of slave women or a blind eye to prostitution in order to make a splash bust.