I just got a call from a guy that wants me to do a hive extraction out of one of his walls. He admitted to spraying the hive with hornet/wasp killer to try to kill them but it didnt work. He sprayed them about three weeks ago. I have heard some of you say that you will not do an extraction if they have sprayed the bees. Why is this? I plan on adding them to one of my existing colonies for the winter (unless there are enough to fill an entire hive).