If this guy said "it will no longer produce", then yeah, he is dead wrong. I have called the same place many times over, with good results. HOWEVER...I do usually let them rest, like Curt said, they will learn not to come, or maybe to keep a good distance. Most of the coyotes that come to my call, never get to be any smarter at all, yet with multiples, the escapees can and do learn. How long they retain the knowledge, and how their hunger level effects their wariness, well that's a whole 'nuther subject. But to say one night of calling KILLS the stand...that's just plain horse crap. Randy