Mr. Baird Sorry for the misunderstanding. In our state you have to be approved by the code officials qualification boardwhich is governed by the state. That is after you pass an exam through a local college. Experience is also required, however I am by no means a professional engineer. I, too, have witnessed incompetence by contractors and inspectors. There is no doubt contractors/inspectors that manage to get by the college test and the state test. There are times that the contractor and myself disagree on building, plumbing, mechanical, electrical, and fire issues[:-thumbu], but for the most part I have a good relatiuonship with the people that come and do work in this jurisdiction. Yes I believe that 95% of HO install double key deadbolts after the C/O is issued.