Aikijitsu is the core arrest & restraint Iíve been exposed to. Itís completely useless IMO. The basic reason that LE where I am (in UK) and Iím sure many places have opted for aiki arts is that it is politically correct. Accusations of police brutality would be even more if the police taught itís guys how to KO someone. Other factors include that most police forces hire whoever happens to be selling whatever. There are plenty of people in the Aiki community who think that theirs is a good way and try to flog their services to LE Ėsadly theyíre mistaken (IMO).