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Opinion of the Court
sons to disperse under the ordinance.32 Similarly, that the ordinance does not permit an arrest until after a dispersal order has been disobeyed does not provide any guidance to the officer deciding whether such an order should issue. The "no apparent purpose" standard for making that decision is inherently subjective because its application depends on whether some purpose is "apparent" to the officer on the scene.
Presumably an officer would have discretion to treat some purposes—perhaps a purpose to engage in idle conversation or simply to enjoy a cool breeze on a warm evening—as too frivolous to be apparent if he suspected a different ulterior motive. Moreover, an officer conscious of the city council's reasons for enacting the ordinance might well ignore its text and issue a dispersal order, even though an illicit purpose is actually apparent.
It is true, as the city argues, that the requirement that the officer reasonably believe that a group of loiterers contains a gang member does place a limit on the authority to order dispersal. That limitation would no doubt be sufficient if the ordinance only applied to loitering that had an apparently harmful purpose or effect,33 or possibly if it only applied to loitering by persons reasonably believed to be criminal gang members. But this ordinance, for reasons that are not explained in the findings of the city council, requires no harmful purpose and applies to nongang members as well as suspected gang members.34 It applies to everyone in the city
32 It is possible to read the mandatory language of the ordinance and conclude that it affords the police no discretion, since it speaks with the mandatory "shall." However, not even the city makes this argument, which flies in the face of common sense that all police officers must use some discretion in deciding when and where to enforce city ordinances.
33 Justice Thomas' dissent overlooks the important distinction between this ordinance and those that authorize the police "to order groups of individuals who threaten the public peace to disperse." See post, at 107.
34 Not all of the respondents in this case, for example, are gang members. The city admits that it was unable to prove that Morales is a gang member but justifies his arrest and conviction by the fact that Morales admitted
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