“By Mr. Guy’s own admission, that did not mean he wasn’t smoking weed and, on occasion, consuming cocaine. The informant, who has not been publicly identified, said it went further. He told a narcotics investigator, Officer John A. Moseley, that a heavyset black man known to him as ‘G’ sold drugs from a blue Crown Victoria on Circle M Drive, according to an affidavit. Officer Moseley knew that the rows of fourplexes on Circle M had long been a hot spot for street crime and drugs.”