I went to a nail salon asked the tech if she could use a callus blade?

Nail technicians are nit M.D.'s. Thus, we are not allowed - by law, to cut living tissue. This includes the use of a 'credo' blade. This is illegal to do in most states. Some of the cheapo salons will do it for you, but not a reputable salon. A tech could lose her license for doing something like this. Let's put it this way. You don't go to a doctor and ask him/her to do something illegal, do you? I didn't think so So, the same applies here. If it's illegal, then it should not be done. Whether you want them to do it or not is irrelevant. Just my opinion...