Q. A friend who is a shatnez tester and I consult him, requested that I ask the Rov, if from experience he knows that the cloth he is being asked to check is not likely to have any shaatnez. Does he have to inform the owner that no testing is required, so he won’t charge him unnecessarily?
A. Horav Shlomo Miller’s Shlit’a opinion is that he should indeed clearly inform the prospective client, what he understands to be the reality of the case. The customer may then decide on his own or he may further consult with a competent Rov, if he has to be stringent or no.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a