I understand your point, but I still strongly believe that extreme care and caution should be used when harvesting. In most cases, it is not necessary to scrutinize every card that may be laying around the casino. It's been my experience that most holes in a collection are quickly filled and one winds up needing something very specific. If you go into a place with that in mind, the card(s)in question shouldn't be hard to spot (if they're there). It's better to just seek out what you need than to risk being barred and placed on some knuckledragging security guard's hit list!