Buy the Book as a reference! "Deutsche Polizei-Uniformen" - by Dieter Deuster -
If you have a general interest in the various POLIZEI branches (& especially if you are interested in the SCHUMA or the TeNo (Technische Nothilfe.) It really clears up a lot of previously unknown, or confusing, information - & the bibliography leads you to the original source, for a further detailed study of the regulations.
I bought my copy on German ebay [ ebay.de ] YES - it is in German, but you don't need to speak German to enjoy the tables (tafels) and photos. I'm slowly translating my copy, [ Babelfish! ] as I find this book to be that worthwhile!... Txs, Dave/dblmed