Four Vicksburg men and a Port Gibson man were arrested separately Thursday on drug charges, three of which resulted from a planned drug investigation conducted by four law enforcement agencies.

Thomas Adcock, 45, 102 Ridgelawn Drive, was arrested at 1:30 p.m. on Interstate 20 East near the Halls Ferry exit after being stopped for a traffic violation, Lt. Bobby Stewart of the Vicksburg Police Department said.

A search of Adcock’s 2009 Ford truck turned up an active shake-and-bake methamphetamine lab in the truck’s cab, along with a small amount of marijuana, Stewart said.

Adcock was charged with manufacturing of methamphetamine, possession of methamphetamine and possession of marijuana, Stewart said.

Dennis Richie, 36, 1033 Mott Headley Road, Port Gibson, was arrested at 3 p.m. on U.S. 61 South at Iowa Boulevard after being stopped for a traffic violation, Warren County Sheriff Martin Pace said.

Pace said a search of Richie’s vehicle found two precursor chemicals commonly used to manufacture crystal methamphetamine.

Richie was charged with possession of two or more precursor chemicals, Pace said.

During the drug investigation that lasted from about noon until 6 p.m., Leonard Lewis, 33, 418 Groome Drive, was arrested at his home after an undercover investigation into complaints of drug activity in the Broadmoor neighborhood, Stewart said.

About a pound of marijuana with a street value of $2,000 was found during a search of Lewis’ home, Stewart said.

He was charged with possession of marijuana with intent to distribute, Stewart said.

In a separate investigation, Patrick Grandberry, 46, 920 Buck St., was arrested at 8:18 a.m. at his home by Vicksburg police after an investigation into complaints of drug activity in the neighborhood, Stewart said.

Officials recovered a quarter-pound of marijuana valued at $400 and two grams of cocaine valued at $400 during a search of the home, Stewart said.

Grandberry was released from the Warren County Jail on a $20,000 bond. Adcock, Richie and Lewis were in the Warren County Jail without bond pending an initial hearing.

Stewart said the collaborative investigation resulted in about 20 traffic stops on the interstate.

Along with the sheriff’s department and the police department, officers from the Mississippi Bureau of Narcotics and Mississippi Highway Safety Patrol participated in the busts.

In the fifth case, which was not related to the others, Michael Parker, 26, 40 Ironwood Drive, was arrested at 9:29 a.m. Thursday by deputies after a traffic stop on U.S. 80 and Mississippi 27, Pace said.

A small amount of cocaine was found on Parker, Pace said, and a search of his car revealed 20 hydrocodone pills in the console.

Parker was charged with possession of controlled substance, Pace said.

He was being held on a $2,000 bond for the drug charge.