***********.centerjd.org/air/TrueRiskF.pdf
here is the study..
look at the tables towards the end, where they compare malpractice insurance cost changes in states that had reforms vs not.
the difference seems to be - insurance companies make more money in tort reform states, but don't lower the rates.

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Человек, который почувствовал ветер перемен, должен построить не щит от ветра, а ветряную мельницу