For what it's worth, here are the notes I made at my DS course at the weekend:
Criminal Law Act 1967:
1. A person may use reasonable force to prevent a crime
2. A person may use reasonable force to carry out an arrest
The force you use must be proportionate to the likely harm to be caused.
The force used has nothing to do with the likely harm caused, the force used must be proportionate to the reason it is being used (stopping vandalism or stopping a murder - protecting yourself from an unarmed person or a person with a rolling pin) and it must only be the amound needed, or necessary to achieve what your lawful goal is (defence of people, property, arrest, etc..).
Common Law:
1. Any person can use reasonable force to defend themselves
2. We can use reasonable force to protect somebody else
3. We can use reasonable force to protect property.
Necessity + proportionality = reasonable force
Proportional to, and minimum necessary to achieve your lawful intention. Make your + an & and you're on target.
Trespass: If behaviour is unreasonable, they can be removed from the premises under the law of trespass (their invitation to enter the premises has been revoked, therefore they are trespassing) - however trespass is a civil law matter, not criminal.
On private property they can be asked to leave for any reason you want. Even if you don't like the colour of their trousers. Explaining such a reason is a little more difficult but at the end of the day you do not legally need to explain anything if you are on private property.
Arrests:
Serious Organised Crime and Police Act 2005:
Any person may arrest without a warrant anyone who commits or has committed an indictable offence.
SOCPA 2005 amended PACE 1984. 24a, "Anyone may arrest without warrant..." and of that it applies against anyone suspected resonably or known to be committing an indictable offence or anyone reasonably suspected to have or is known to have committed an indictable offence; and a few other conditionse such as prevention or harm, no police officer being available to do it.
The actual power of arrest is provided in PACE, not SOCPA.
Indictable: deal with in a Crown Court (e.g. murder, manslaughter, rape, indecent assault, theft, robbery, burglary, ABH, GBH, etc).
For an arrest to be legal, you *must* inform the person that they are under arrest. You are responsible for their welfare, safety and security.
You must inform them who you are, who you represent, that they are under arrest and why they are under arrest.
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Our Physical Intervention tutor and our Door Supervisor course tutor both emphasised the necessity and proportionality of any force which we would use. They also emphasised that conflict management techniques were essential - the message to me was clearly "physical intervention is a last resort".
My understanding of using physical force to eject an aggressive person is as follows:
- it should be a last resort (using conflict management techniques, you ideally will get them to a position where they are willing to leave the premises)
- the person has been asked to leave (thus legally making them a trespasser on the premises - not arrestable by a door supervisor, but enough to justify ejecting them)
- the person refuses to leave, and so using proportionate and necessary force, you move them towards the exit
I've never been in the position to use this, obviously, but if you have used proportionate and necessary force, you'd be covered in a court of law. Several people who have commented on different threads on this forum have stated that they have never had to use force - they have used their mouths and their brains! That's the example I plan to follow!
My yellow. Who was your training provider, might I ask..?