Verb or Noun?

It is probably a firm belief of some municipal employees that the rules of grammar are different for them as compared to the rest of the world. It is with this conviction that they draft letters. Their superior officers either share the belief or are not bothered enough to check spelling and grammar in the letters they sign. The result is that people receive letters from the concerned persons which sometimes bordering on hilarious. Look at the following example. The university has asked for detail information of all teaching staff. All heads of departments concern should send the information to the undersigned by tomorrow noon without fail. I would have been happier if 'detailed' had been printed in place of 'detail' and 'concerned' in place of 'concern'. The part 'without fail' should be removed totally. An unfortunate part of the use of bad grammar is that new appointees believe this is the approved grammar and spend an entire career writing such English. Since most of these letters are circulated within the institute or withing corporation offices at the most, the outside world does not come to know about it. That is a great face saver.