Looks Clean, Smells Clean

I had a first yesterday. One of my students didn't wash his hands after using the bathroom in our room. I told him to go back and wash. Well, he had a fit and said that he did wash. Calmly I said to do it again just to please me. With that he responded, "My mom always smells my hands to see if I washed." Still trying to be calm, I replied, "Well, I'm not going to do that. Just go wash your hands." In years past I have been asked to do a lot of things, even go in the bathroom and look at the number 2, but never smell the hands. I think he just earned a D- in Health for the week. And I won't be holding his hands soon.