Sex offenders may continue to re-offend for a number of years but the length of time needs to be determined to calculate a rate . Finally , the nature of recidivism may vary so no generalizations can be made . The laws in place do not take into consideration any specificity in the types of sex offenders . Since recidivism is so hard to predict , monitoring sex offenders by polygraph testing seems like a good idea . Polygraph testing is also used in investigation procedures...











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