The Thin Blue Line Notebook serves our communitys men and women in uniform. Designed to meet strict requirements for evidence gathering. the Thin Blue Line Notebook is a professionals tool. It is fully weatherproof to save vital case notes from the elements and fits easily into any uniform pocket. It features permanent binding and numbered pages to prove sequence for valid testimony. A small evidence ruler on the back cover can act as a photo scale. If you work in law enforcement. this is the pad youll want to have in your pocket when you have something important to note.