Weapons - police arts
When Seishiro 'Henry" Okazaki (1/28/1890 - 7/12/1951) was teaching his Danzan ryu style of jujutsu and judo in Hawaii he grouped various techniques. Those groupings are still taught today by most of the descendant versions of his art. Historically, the defense emphasis in jujutsu and judo and other similar martial arts has been to be able to fall safely and to escape grabs, throws and locks. At the same time, the offense emphasis has been to be able to grab, lock or throw an opponent. Okazaki re-combined about seventy-two techniques from other groups and added eighteen new techniques to produce a new grouping he called police arts. A challenge today is those police arts are not frequently taught any more, in part because they do not reflect changes in police procedures motivated by legislation. Both during Okazaki's lifetime and in the more than 70 years since his death there has been some drift in both the specific techniques included as well as how (and when) the techniques are to be done. Web pages with commentaries on the specific Danzan ryu techniques will be added. 

Both Brazilian Jiu-Jitsu and the somewhat similar Gracie Jiu-Jitsu can be used as a foundation for police arts
as can several versions of aikido.
  
I personally have little knowledge of the martial art of Krav Maga so I will just note that it was developed by Imi Lichtenfeld for the Israeli Defense Forces and the Israeli Security Forces in the 1930s. Krav Maga incorporates elements of karate, judo, wrestling, boxing and aikido. Like many of Okazaki's techniques, for better or for worse, there are considerable limits on what Krav Maga techniques a police officer can use.

After World War II a committee of Japanese experts codified a specialty martial art named Taihojutsu. In the United States the dominant organization is the United States Ju-Jitsu Federation (USJJF®), which was founded in 1971 by George E. Anderson (1931-2009).      
    

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