White K, et al. - Arrest occurs in just one in ten nonfatal shootings in Chicago. Unlike in fatal cases, useful information can be often gained from gunshot victims who survive in the police investigation. However, much lower arrest rates are recorded in nonfatal shooting cases in Chicago and elsewhere than fatal cases, in part because most victims do not cooperate. Using data from the Chicago Inmate Survey (CIS), researchers sought to determine the potential value that gunshot-victim cooperation could have for increasing arrest rates. Half of CIS respondents described they had been shot before. Cooperation was observed with police investigations of these shootings in very few cases, although at least half of them could have yielded valuable information. Choice of non-cooperation was explained by respondents by reference to “street codes” against snitching, mistrust of the police, and the desire to retaliate against the shooter personally. By persuading more shooting victims to cooperate, the police could solve more cases and hence be more effective in curtailing gun violence.