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Letter   |    
E. Fuller Torrey; Jonathan Stanley
Psychiatric Services 2008; doi:

In Reply: We thank Dr. Lamberti for his clarification. In his 2007 article he noted that the MacArthur study reported a "lack of an association between psychosis and crime," and his was one of many similar references that we had noted over the years. He is correct that his article did not claim that the MacArthur results can be generalized; however, once a finding is repeated often enough in the literature, it develops a life of its own and tends to be generalized.

The main purpose of our undertaking the debate in the February issue was to make clear that on the basis of data from the MacArthur study that became available after the original publication, it is erroneous to cite the study as having shown a "lack of an association between psychosis and crime." Dr. Lamberti is also correct that several more recent studies have clearly shown that "active psychosis is an additional risk factor for violent crime." In his 2007 article, Dr. Lamberti cited the 2006 study by Swanson and colleagues (1), and we would add three others (2,3,4).

The most important point made by Dr. Lamberti, and also by subsequent publications on the MacArthur study, is that the treatment of individuals with psychoses significantly reduces the incidence of their violent behavior. The question he raises about "how to engage high-risk individuals in treatments" must take into account the fact that approximately half of such individuals are unaware of their own illness and of the need for treatment. In these cases treatment must sometimes be mandated, by using such mechanisms as assisted outpatient treatment, which has been demonstrated to significantly reduce violent behavior among individuals with severe psychiatric disorders (5).

Swanson JW, Swartz MS, Van Dorn RA, et al: A national study of violent behavior in persons with schizophrenia. Archives of General Psychiatry 63:490—499, 2006
 
Swanson JW, Swartz MS, Essock SM, et al: The social-environmental context of violent behavior in persons treated for severe mental illness. American Journal of Public Health 92:1523—1531, 2002
 
Monahan J, Steadman HJ, Robbins PC, et al: An actuarial model of violence risk assessment for persons with mental disorders. Psychiatric Services 56:810—815, 2005
 
Swanson JW, Van Dorn RA, Monahan J, et al: Violence and leveraged community treatment for persons with mental disorders. American Journal of Psychiatry 163: 1404—1411, 2006
 
Swanson JW, Swartz MS, Borum R, et al: Involuntary out-patient commitment and reduction of violent behaviour in persons with severe mental illness. British Journal of Psychiatry 176:324—331, 2000
 
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References

Swanson JW, Swartz MS, Van Dorn RA, et al: A national study of violent behavior in persons with schizophrenia. Archives of General Psychiatry 63:490—499, 2006
 
Swanson JW, Swartz MS, Essock SM, et al: The social-environmental context of violent behavior in persons treated for severe mental illness. American Journal of Public Health 92:1523—1531, 2002
 
Monahan J, Steadman HJ, Robbins PC, et al: An actuarial model of violence risk assessment for persons with mental disorders. Psychiatric Services 56:810—815, 2005
 
Swanson JW, Van Dorn RA, Monahan J, et al: Violence and leveraged community treatment for persons with mental disorders. American Journal of Psychiatry 163: 1404—1411, 2006
 
Swanson JW, Swartz MS, Borum R, et al: Involuntary out-patient commitment and reduction of violent behaviour in persons with severe mental illness. British Journal of Psychiatry 176:324—331, 2000
 
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