I went with an outfitter that didn't want them in his camp. Of course outfitters worry about success rates so probably mulch over everything to much. They had said that the thermoscells toss out scent after the time they have been around them. I don't know nothing about what they say cause we don't have to worry much about such things here. We were more worried about having a great hunt so we heeded there warnings. We used bug suits with good results but thank you for the added info that will be added in the memory bank. Lot of big bears with thermocell.