RALEIGH — Police said in an arrest warrant that a 28-year-old man sold 20 doses of heroin to an undercover police officer before they arrested him on charges of trafficking the narcotic and having between 4 and 14 grams of it.

Evan Taylor Stiff of 9121 Sweetbrook Lane, Apartment 104, in Raleigh was arrested Tuesday afternoon outside a shopping center about 2 miles away from his home, according to a police report of the arrest.

According to arrest warrants, an undercover police officer bought 0.8 grams of heroin from Stiff in the form of 20 bindles, the word used for a single dose of the drug.

Stiff had between 4 and 14 grams in total, police charged. That range is one specified in state law for a certain class of felony.

The charges against Stiff, who was being held Wednesday on an $80,000 bond, were selling heroin; delivering heroin; possessing heroin with intent to manufacture, sell or deliver it; trafficking in opium or heroin and conspiracy to traffic in heroin. All are felony counts.

The conspiracy charge, the warrants say, involves Tyhean Maurice Harris, 28, of Henderson, whom police had arrested on Aug. 3 on a trafficking charge.

Harris has been in custody at the Wake County Detention Center on a $250,000 bond.