Can a city offer a reward for information leading to the arrest of a convicted felon?

we think it follows that for a public entity to be bound by a reward contract, a reward offer must be made pursuant to the entity's charter or other governing legal authority. (See Griffin v. City of Los Angeles (1933) 134 Cal.App.763, 774 [stating that Los Angeles may offer reward for information leading to felon's arrest so long as city council takes the action under then-proper principles]; City of Los Angeles v. Gurdane, supra, 59 F.2d at p. 164 ["'a public officer cannot bind the state or any of its subdivisions by such an offer unless authority is conferred by legislation'"].)