The Megan's Law Unit of the Essex County Prosecutor's Office works to protect potential victims from convicted sex offenders who are on probation or parole and now living in the community. Enacted in 1994, Megan's Law is named in memory of Megan Kanka, a seven-year-old girl who was raped and murdered by a neighbor who was a convicted sex offender. The law is intended to inform members of the public about the presence of sex offenders in their community. The Megan's Unit is responsible for evaluating whether a convicted sex offender is likely to commit another sex crime.

Using guidelines established by the Attorney General's Office, the Unit provides information to help judges determine whether a sex offender should be classified as a Tier 1, Tier 2 or Tier 3. Those who pose the greatest threat to the community are listed as Tier 3 offenders. Their names and information about their offenses can be found on a Sex Offenders Internet Registry which is maintained by the New Jersey State Police.

Typically, residents, schools and others likely to encounter these offenders are alerted that they are living or working in a particular neighborhood. Not all convicted sex offenders are on the registry. Tier 2 offenders, those posing a moderate risk, can also be listed on the registry. Generally, Tier 1 offenders would not be on the registry. Once a sex offender has been classified, the Megan's Law Unit sets up the process to notify those who are entitled to the information. Members of the Unit may also speak to community groups to help them understand the process.

Whenever a Megan's Law offender moves, takes a new job or commits a new crime the process begins over again.