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In 1947 canada first introduced legislation to deal with dangerous offenders that qualified with the act called "the habital offender act", to be considered a habitual offender, the offender has to be conficted of three or more indictabl charges, the act was designed to incapcitate offenders with lengthly cominal records by keeping them in prison and away from the general public.
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In 1948, the second piece of legislastio which was known as the 'sexual psychopath act passed to ensure that dangerous sexual offenders would be identified and treated by mental health professionals.
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In 1953, the legislation was amended to include buggery, beastiality, and gross endecency.
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In 1960, thee dangerous offenders act replaced the 1948 legislation and set out the spefic criteria for determining violent offenders which also includes criminal records and circumstances of the their offences,
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In 1969, report of the canadian committee in corrections found that the habiutal and dangerous sex offender legislation also know as statues were being applied in effectively.
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In 1977, the new legislation was enacted which repealed both habitual. The new act was designed to be applicable to both sexual offenders and those who had committed violent acts,
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In 1977, bill C - 55 was enacted it made significant changes to strengthen measures for dealing with the most dangerous offenders, this act required the testimony of only one psychiatrist instead of using two used in past at a dangerous hearings lengthened parol eligibility.
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In 1985 school principal Robert Noyes was convicted of 31 counts of sexual abuse against 19 school children aged 6-15. He was diagnosed a homosexual pedophile and was given an indefinite term of incarceration in 1986. At Robert's hearing, experts testified that he could never be cured of his compulsion to molest children.
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In Febuary 2011, Johnson aziga was convicted of murder through transmission of HIV. In 2011 the judge had convicted him of the dangerous offender act, he was charged with a life sentence without the possibility of parol, unless parol board thought he wasnt a threat anymore. Convictions were related to 11 women, seven women were infected, 2 women died. Had sex with the women without warning of his HIV.
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In Canada and England and Wales, certain convicted persons may be designated as dangerous offenders and subject to a longer, or indefinite, term of preventive detention in order to protect the public.