Rowan authorities charged six people in separate incidents with various drug possession offenses during a four-month period.

The undercover investigations occurred between September and December, after the Sheriff’s Office received complaints of drug activity. The Cabarrus County Sheriff’s Office, Spencer Police Department and the China Grove Police Department assisted the Sheriff’s Office in the investigation.

The following people were arrested, charged:

• Derrick Jewone Blackwell, 42, of the 500 block of Hickory Nut Lane, China Grove, was charged on Jan. 30 with one count of selling cocaine, one count of delivering cocaine, one count of possession with intent to sell/deliver cocaine, one count of conspiracy to sell cocaine, one count of conspiracy to deliver cocaine, one count of possess with intent to sell and deliver a counterfeit controlled substance, and one count of sell/deliver a counterfeit controlled substance. The offenses all occurred on Sept. 15, officials said. Blackwell remains in the Rowan County Detention Center under a $25,000 secured bond.

Blackwell has 2012 felony convictions in Rowan County for three counts of possession with intent to sell/deliver marijuana, one count of possession with intent to sell/deliver cocaine, one count of selling cocaine, one count of selling marijuana, one count of possession of cocaine, and two counts of maintaining a vehicle or dwelling place to keep and sell controlled substances.

• Jerry Phillip Ritchie Jr., 52, of the 4400 block of Davidson Road, Davidson, was charged on Jan. 20 with two counts of sell and deliver oxycodone, two counts of possess with intent to sell and deliver oxycodone, two counts of maintaining a vehicle or dwelling place to keep and sell controlled substances, and two counts of manufacture, sell and deliver or possess controlled substances within 1,000 feet of a school. The offenses occurred on Oct. 6 and Oct. 7. Ritchie remains in the Rowan County Detention Center under a $75,000 secured bond.

• Sheila Bobbitt Smith, 44, of the 300 block of South Oakhurst Drive, was charged on Jan. 30, with one count of sell and deliver oxycodone, one count of possess with intent to sell and deliver oxycodone, and three counts of trafficking heroin or opium. The offenses occurred on Dec. 3 and Dec. 12.  Smith remains in the Rowan County jail under a $75,000 secured bond. Smith has a 1991 felony conviction in Rowan County for possess with intent to sell and deliver cocaine.

• Michael Tyrone Bost, 51, of the 1000 block of Glock Court, was charged on Jan. 30 with one count of conspiring with Sheila Smith to sell oxycodone. The offense occurred on Dec. 3, officials said. Bost was issued a $10,000 secured bond and his since been released from the Rowan County jail.

• Jeffrey Alan Nunn, 42, of the 1000 block of Spring Meadow Drive, Woodleaf, was charged on Feb. 1 with one count of possession of heroin and one count of possession of drug paraphernalia.  The charge resulted from a traffic stop on Dec. 8. Nunn remains in the Rowan County Detention Center under a $1,000 secured bond.

In 2006, Nunn was convicted in Rowan County of four felony counts of second-degree rape and one felony count indecent liberties with a child. Additionally in 2013, Nunn was convicted in Rowan County of failure to report a change of address as a registered sex offender.

•Brenda Kay Clark, 38, of the 700 block of China Grove Highway, Rockwell, was charged on Feb. 3 with one count of possession with intent to sell/deliver cocaine, one count of selling cocaine, one count of delivering cocaine, and one count of conspiracy to sell cocaine.

Officials said she was arrested at a residence in the 200 block of Crescent Heights Drive. Clark was caught in an undercover sting operation selling crack cocaine to an undercover officer on Sept. 12, a statement said.  Clark remains in the county jail under a $20,000 secured bond.