The Jitsu Foundation or TJF is a national-level association of jujutsu clubs headquartered in the United Kingdom, but also has affiliated organisations in other countries around the world (Australia, Canada, Cyprus, Holland, New Zealand, South Africa, USA). Focusing on standing throws and locks using weakening strikes to assist, the style taught within the association is known as Shorinji Kan Jiu Jitsu(少林寺完柔術^?).

Shorinji Kan Jiu Jitsu is taught as a self-defence system which acknowledges that situations may include multiple armed or unarmed opponents, rather than a single "one on one" officiated match. Joint locks and throws complemented by weakening strikes are employed to deal with attackers in an efficient way. The style includes some treatment of groundwork (newaza) however to a lesser degree than some sports-based styles of jujutsu. Much of the competition focus of styles such as Brazilian Jiu-Jitsu and Judo is ignored in favor of maintaining focus on the complete surroundings with all possible threats considered. The commonly held prescriptions of "clean fighting" are disregarded in the Jitsu Foundation and the use of all advantages available (including groin strikes, hair pulling, spinal locks, eye rakes, and to a small extent nerve points) is encouraged - although in competitions such as the Judo Nationals, these are not employed). The style has adopted the name 'jitsu', a shortened version of 'jiu jitsu,' or 'jujutsu.'

A police officer (also known as a policeman or policewoman, and constable in some forces, particularly in the United Kingdom and other Commonwealth nations) is a warranted employee of a police force. In the United States, "officer" is the formal name of the lowest police rank; in many other countries "officer" is a generic term not specifying a particular rank, and the lowest rank is often "constable". Police officers are generally charged with the apprehension of criminals and the prevention and detection of crime, and the maintenance of public order. Police officers may be sworn to an oath, and have the power to arrest people and detain them for a limited time, along with other duties and powers.

Some police officers may also be trained in special duties, such as counter-terrorism, surveillance, child protection, VIP protection, and investigation techniques into major crime, including fraud, rape, murder and drug trafficking.

Responsibilities of a police officer are varied, and may differ greatly from within one political context to another. Typical duties relate to keeping the peace, law enforcement, protection of people and property, and the investigation of crimes. Officers are expected to respond to a variety of situations that may arise while they are on duty. Rules and guidelines dictate how an officer should behave within the community, and in many contexts restrictions are placed on what the uniformed officer wears. In some countries, rules and procedures dictate that a police officer is obliged to intervene in a criminal incident, even if they are off-duty. Police officers in nearly all countries retain their lawful powers, while off duty.