Penalties?

I would think that the penalties for their activity is the only deterrent.

28.0407 Penalty.
(a) Except as provided in subdivisions (b), (c) and (d), a violation of this chapter is an infraction punishable by a fine of not more than two hundred dollars ($200).
(b) A second violation of this chapter that is committed within three years after a prior violation for which there was a conviction is an infraction, punishable by a fine of not more than four hundred dollars ($400).
(c) A third violation of this chapter that is committed within three years after two violations for which there were convictions is an infraction, punishable by a fine of not more than five hundred dollars ($500).
(d) A fourth or subsequent violation of this chapter that is committed within three years after three or more prior violations for which there were convictions is a misdemeanor, punishable by a fine of not more than one thousand dollars ($1,000) or by imprisonment in county jail for not more than ninety (90) days, or by both fine and imprisonment.
Adopted Ordinance 1590 (1970); Amended Ordinance 3096 (1986); Amended Ordinance 3973 (2006)