Can someome tell me how many plumbers it takes to perform a dsw smoke test to determine a gas leak? Is it possible for this test to be done by only one person and accurately detect the source of a leak, if any, when you are inspecting an entire attic, all bthrm fixtures, etc. I am skeptical of the job this plumber did. Need to make sure he performed it thoroughly and accurately to ensure I was not duped out of a lot of money

