My Daughter years ago raised Show Birds in 4-H and FFA. To be able to be brought into the Southeastern Youth Fair, All Chickens had to be Dusted with Vegetable Grade Sevin Dust 5%, then washed a few days later. All Birds had to pass inspection before they were allowed into the facility. My question is does anyone here do this to treat or prevent infestations, or are there any other alternatives? Also does using Sevin Dust make your Eggs inedible? Is there a withdrawn period?