Police charged a 28-year-old town man by warrant for possession and sale of narcotics and other charges last week after an investigation of nearly a year by detectives on the town’s Selective Enforcement Unit, according to Darien Police Sgt. Jeremiah Marron.

The unit began investigating the man, Peter Samaha of 12 Leeds Lane, after developing leads based on anonymous complaints he was selling drugs from his home, Marron said. The investigation began in November 2014, Marron said.

Police executed a search warrant at Samaha’s home in late August and found 21 paper folds containing a brown powdery residue later confirmed as heroin, numerous cellular phones, 2.6 grams of marijuana, and an unidentified pill later confirmed to be Ritalin, Marron said.

Samaha was charged with one count each of sale of narcotics, possession of narcotics, possession of less than half an ounce of marijuana, and possession of drug paraphernalia, according to Marron.

He was released on a promise to appear in state Superior Court in Stamford.