The study examined the percentage of Chicago adult male arrestees reporting ownership and use of firearms; the types of firearms possessed; whether firearms were used during the commission of current offenses; and the relationships between gun ownership, drug use, arrest charge, and gang membership. Fewer than 20 percent of the Chicago arrestees had ever owned a gun, but 67 percent said that their neighborhoods had lots of guns. More than half the participants said they had been threatened by a gun; one-fourth said that they had been injured by gunshots. Being in a gang and selling illegal drugs were related to an increase likelihood of ever having owned a gun and of being in a setting where guns were common. The average participant was a 28-year-old single black male. About 40 percent did not have either a high school diploma or a GED. Ninety-nine percent of the top arrest charges were felony offenses, particularly drug possession, larceny/theft, assault, and weapons offenses. Eighty-three percent of the sample tested positive for any drug; 58 percent tested positive for drugs other than marijuana. Comparison of Chicago and national data, figure, and table