Well yeah.. so if in the course of servicing a bike, and the shop does not see any cracks or other frame damage, they would be kinda stoopid to tell the customer they looked it over on their own initiative and btw the frame is safe and fine to ride. OTOH, if they come across what appears to be a crack or damage, I can't imagine an increase in liability from telling the customer that they found such and that they advise having an expert check it out further before riding.