Most of my research iis from the USA but that's where the "sex offender"laws emanated from in 1994 after a disturbing rape and murder of a child.
One simple aspect is that as sex crimes have never decreased since then, obviously these laws are of no use. But they could have the opposite effect-tying up recourses and concentrating law enforcement on an "after the crime" fact instead of prevention and safety.
Consider this : The USA may soon have a vice-president..and given John McCain's health, a
PRESIDENT PALIN whose future son-in-law ,by a quirk of nature born in Alaska but in other states of the USA..would be
CONVICTED SEX OFFENDER and placed on a register for life.Bristol Palin became preganant at the age of 17 ( we don't know how long she and her boyfriend had been having sex though). Her soon-to-be husband would be branded a peadophile or indeed, a VILE PERVERT !. Obviously he isn't but it's a good example of the total unfairness of these stupid laws that now brand nearly 2 million people in the USA-the vast majority who have their own familes and children and who are forced to pay a price.
reoffending rates for"sex offenders":5% -far less than any other group of offenders, yet all released from jail are tarred with the same brush and given extra unfair punishment.
figures form the U.S.Department of Justice
www.ojp.usdoj.gov/bjs/pub/press/rsorp94pr.htm