A note, while the article does not say this, it is very unlikely that any home of a registered person -NOT under State Supervision- was searched, that would violate the 4th Amendment, at least without a warrant.7-30-2011 Rhode Island:
PROVIDENCE, R.I.—A law enforcement task force led by U.S. marshals arrested eight registered sex offenders in Rhode Island after making unannounced visits to their homes.
The task force checked up on 200 registered sex offenders across the state this month to verify that they were living at the addresses listed in the sex offender registry.
Five of the men arrested were charged with possession of marijuana or cocaine. One was arrested on an outstanding warrant, one for failing to update his registration, and one for possession of child pornography.
The arrests were announced by the Marshals Service on Friday. The task force includes state, local and federal law enforcement officials. Since 2007 the task force has checked up on the whereabouts of 700 sex offenders in Rhode Island. ..Source.. by Boston.com