Is Justice Alito's claim about sex offender rearrests true?

6-21-17 U.S. Sup Court:

Justice Alito made a misleading claim about recidivism rates among sex offenders in his concurring opinion for Packingham v. North Carolina. (Meg Kelly / The Washington Post) ..Source..

Unfortunately Justice Alito was reciting something "specific" from a earlier court case, and this is something that happens all too often, rather than the holding of the earlier case and comparing facts to whatever the current discussion is.

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In 2006 eAdvocate tested "Specialization" (rearrests)(which crime types were more likely to commit the same crime type again following conviction (true recidivism)). See Specialization: What is it, and why it is critically important to legislative vision? Here

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