After Superstorm Sandy many New Jersey residents were displaced, including some Megan's Law sex offenders.

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The vast majority of them have been accounted for, but some have dropped off the grid, and now law enforcement officials have stepped up efforts to find them.

"These individuals, if undetected, pose a considerable risk to the community, so it's very important that we act aggressively in locating non-compliant offenders because the potential to re-offend is always there," says Senior Inspector with the U.S. Marshal Service Sex Offender Investigators Branch, Mike Romani.

He says, not surprisingly, many offenders want to keep a low profile, and the vast majority of them do not want their identities - their criminal histories known- so the temptation is there to try and take advantage of a natural disaster like Hurricane Sandy, and disappear.

Romani adds most of these non-compliance offenders, when tracked down and cornered, will not put up a fight.

"But we've also noticed a disturbing trend across the country where non-compliant offenders are becoming more violent -they have a strong resistance on going back to jail," he says.

He also says any citizens with concerns about possible sex offenders in their communities should reach out to their local County Megan's Law units because they welcome information about offenders or potential offenders.

In the State of New Jersey, failure to register as a sex offender is a felony under the federal statute the penalty is up to a 10 year prison sentence.