FREEHOLD -- A five-month, county-wide undercover operation led to the arrests of more than 40 people and the seizure of 2,700 bags of heroin, 300 grams of cocaine and 16 ounces of marijuana, authorities announced on Thursday.

The multi-agency investigation, dubbed "Operation Justice Served," focused on a drug-distribution network based out of Freehold Borough, Monmouth County Prosecutor Christopher Gramiccioni said.

Gramiccioni said the investigation started in late spring after authorities arrested Kenneth Crooms, 44, of Freehold Borough. The investigation, the prosecutor said, grew from there and led to the arrests of 42 people in October, many of whom are from western Monmouth County. Four suspects remain at large.

In all, authorities seized 2,700 bags of heroin, 300 grams of cocaine, 16 ounces of marijuana and dozens of prescription pain medications such as oxycodone and Percocet.

Gramiccioni said the drug-trafficking ring was selling approximately 2,500 bags of heroin and 200 grams of cocaine a week.

"The joint efforts of these multiple law enforcement agencies involved in Operation Justice Served have accomplished the mission of taking down this local drug-trafficking network responsible for bringing drugs into the county and threatening the quality of life and the safety of residents," Gramiccioni said in a statement.

The following individuals are each charged with various counts of distribution of a controlled dangerous substance and possession of a controlled dangerous substance:

* Newman Davis, 39, of Freehold Township

* Carson Givens AKA Carson Crooms, 36, of Manalapan Township

* Welman B. Crooms, 39, of Freehold Township

* Andre L. Williams, 40, of Bayonne

* Kayla Vold, 22, of Freehold Township

* Kelly L. Andriessen, 21, of Freehold Township

* Erikan Hassan, 34, of Manalapan Township

* William Torres, 54, of Freehold

* Juan Heredia, 31, of Freehold

* Michael W. Garrett, 49, of Freehold. Garrett was also charged with possession of a firearm.

* Amanda N. Rivera, 35, of Long Branch

* Angel J. Fuentes, 25, of Somerset Township

Police are still searching for Givens, Welman Crooms and Andriessen, Gramiccioni said.

Authorities said the following 28 individuals regularly met with Kenneth Crooms or Newman Davis to purchase drugs. They were charged with possession of a controlled dangerous substance and conspiracy to possess a controlled dangerous substance.

* John Smith Jr., 41, of Freehold

* Ahmed Ibrahim, 25, of Freehold

* Shannon Gregory, 24, of Howell

* Cody Olmo, 25, of Oceanport

* Eric Alleyne, 46, of Freehold

* Emmett Odonnell, 49, of Freehold

* Stevens Cordova, 36, of Freehold

* Jason Galatro, 45, of Freehold

* John Loprete, 56, of Freehold

* Michael Perri, 47, of Freehold

* Christopher Odonnell, 53, of Monroe Township

* Austin Ventura, 27, of Manalapan

* James Mulligan, 61, of Freehold Township

* Fabrizio Illiano, of Freehold

* Giovanni Illiano, 46, of Freehold Township

* Louis Almonte, 46, of Freehold

* Richard T. Burger, 46, of Freehold Township

* Michael J. Migliore, 43, of Freehold Township

* Jaclyn R. Nalven, 31, of Freehold Township

* Gina B. Levtov, 35, of Manalapan Township

* Kevin Bellach, 44, of Freehold Township

* Peter C. Stiles, 46, of Freehold

* Michael J. Ferriole, 37, of Freehold Township

* Richard J. Pretty, 42, Howell Township

* Eric Ousley, 55, of Freehold Township

* Darren Whiting, 48, of Freehold

* Kevin L. Washington, 52, of Millstone Township

* James M. Fair, 51, of Freehold

* Husmir Salihagic, 32, of Freehold

* Jennifer Suydam, 28, of Marlboro

* Christine Hicks, 43, of Freehold Township

* Anthony Macario, 49, of Jackson

* Tahean M. Greenhow, 46, of Freehold

Olmo remains at large, Gramiccioni said.

He asked that anyone with information about the whereabouts of Givens, Welman Crooms, Andriessen or Olmo call Detective Christopher Guy of the Monmouth County Prosecutor's Office at 1-800-533-7443 or the local police. Gramiccioni urged the public not to attempt to apprehend these individuals.

Anonymous tips can also be submitted to the Monmouth County Crime Stoppers' confidential telephone tip-line by calling 1-800-671-4400 or submitted via text message to 274637. In the text message, include the words "MONMOUTH" and the tip. Tips can also be emailed through the website at www.monmouthcountycrimestoppers.com. Monmouth County Crime Stoppers will pay up to $5,000 for information leading to the arrest of fugitives.

Gramiccioni commended the following agencies for their "hard work and dedication" to the investigation: Freehold Boro Police Department, Freehold Township Police Department, Marlboro Police Department, Manalapan Police Department, Howell Police Department, Brielle Police Department, Asbury Park Police Department, Monmouth County Sheriff's Department, Eatontown Police Department, the New Jersey State Police, the Drug Enforcement Administration and the US Marshals Service.

The 42 individuals charged in the bust face anywhere from three years to 20 years in prison depending on the severity of the charge.

Alex Napoliello may be reached at anapoliello@njadvancemedia.com. Follow him on Twitter @alexnapoNJ. Find NJ.com on Facebook.