these are things like penicillin and tetra sigh psych cycline. when you put that in their feed pretty much continuously over the life of the bird what you end up doing is creating and helping to spread bacteria in those birds that are resistant to those ant bottlics and then those -- antibiotics and those resistant bugs can spread to the meat we eat or in the farm environment and then reach people. so by taking those out of the chicken supply chain mcdonald's is doing a good thing. those human antibiotics account for about 60% of all the antibiotics used in agriculture. even by buckle they are about 60%. they are not important to humans so there is still some potential that they carry some risk to humans down the road. but for right now, i think mcdonald's has the emphasis right. >> so let's say you've been selling chickens to mcdonald's, maybe for a long time because they have very significant relationships with their suppliers. you get the note from company headquarters in illinois that now they don't want you to use this anymore. is it hard to