I would expect is meant here

you should have further context to know if this relates to immigration or asylum seekers or illegal migration. I suspect it is illegal migration as it is unlikely that legal immigrants would be subjected to involuntary hospitalisation

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Note added at 1 day23 hrs (2013-09-13 09:52:01 GMT)
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It is important not to over translate here by adding things that are not in the original document. If in doubt, ask the author.

People are involuntarily hospitalized in some countries but in the West I feel it is unlikely to happen to LEGAL immigrants. This is far more likely to happen to illegal migrants and asylum seekers and there could be many reasons for this including contagious diseases, if they are are pregnant, are considered to be mentally unstable, and so on.

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Note added at 1 day23 hrs (2013-09-13 10:04:26 GMT)
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Of course in terms of domestic violence, there are some women who refuse to go to hospital as they are so afraid of their husbands or are mentally unstable themselves, so INVOLUNTARY hospitalization is sometimes necessary for their well-being and safety.

so

procedures where people are involuntarily hospitalized because of domestic violence, immigration and the prison system

Gender Violence, Immigration Status or Imprisonment.
Not all immigrants are undocumented immigrants. I think Immigration Status covers it.
Also, I think the text refers to persons who have been imprisoned (which is related with having committed a serious crime). Not enough to just mention the prison system in this case, but associate it with the person in question (regarding involuntary hospitalization).



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Note added at 2 days15 hrs (2013-09-14 01:44:29 GMT)
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The original text mentions people with mental disorders who are being subjected to involuntary hospitalisation (against their will).
Gender violence, immigration status and imprisonment are intervening variables, therefore the “procedure” needs to take into consideration those “special circumstances.” They are not being involuntarily hospitalized because of any of these 3 circumstances. There is talk of duty rota because of these people experiences any of these circumstances, which are NOT the cause of involuntary hospitalization.
In the presence of mental illness, anyone can be .involuntary hospitalized if there is a need to protect the safety of that person or others. A person suffering mental illness can refuse hospitalization) and still be involuntarily hospitalized in all the cases mentioned in the original text:
- that person has been the perpetrator or the victim of violence by a partner, a spouse, or a date
- his/her immigration status: on a visitor’s visa, a permanent resident, on a student visa, temporary work visa, is a refugee claimant, or is ‘undocumented’
- person has been found to be criminally responsible and/or imprisoned.