From the book

Keishichō Budō Kyūjū Nen-shi

(警視厅武道九十年史 - The 90-Year History of the Metropolitan Police Department’s Martial Arts)

Published in 1965 by the:

Keishichō Keimubu Kyōyōka Hen

(警視宁 警務部 教養課編 - Compiled by the Metropolitan Police Department, Training Division)

"In the autumn of 1882, a letter was sent from the Metropolitan Police Department to Master Saizō Shimosaka, the teacher of Nakamura Hansuke, inviting him to become the first jūjutsu shinan-yaku (chief jūjutsu instructor or advisor).

However, Master Saizō Shimosaka was unable to move to Tokyo due to personal circumstances. Instead, he recommended the following four individuals:

• Tetsutarō Hisatomi of Sekiguchi-ryū

• Chūdan Naka of Sekiguchi Shinshin-ryū

• Shō Uehara of Ryōishintō-ryū

• Hansuke Nakamura of Ryōishintō-ryū

Shortly after, the Metropolitan Police Department sent an official letter of acceptance. Determined to prove the true worth of Kurume jūjutsu, they arrived in the bustling capital of Edo in March 1883.

That same year, in January, an internal directive was officially issued to all police stations:

“From now on, all officers stationed at various police posts shall train in jūjutsu, just as they do with gekken (sword training).” "