Sonofswamp With that statement then I must assume that you call out mold with out any question. I am not an asbestos expert and will never claim to be, that being said I will never positively call out :asbestos", I will always state "what appears to be Asbestos". We have some other insulation that looks very similar to the asbestos and most of the time you can tell the difference but I will never call it out as asbestos. I was in the Plb & HVAC trade for over 27 years and have come across more "what appears to be asbestos" and I all ways informed the client to have it properly tested for verification. I do not know what instructors that you have had in the past but most all of the ones that I have knew the business better than most HI's I have ever meet. (no I am not an instructor) Remember Hi's are generalist and not specialist in all aspects of the home, so don't try an be by calling things out you do not know for sure.