More likely than not, the Ocala PD will use the time-honored legal standard of "I know it when I see it" to eyeball the location of waistlines relative to pants lines. The not-too-subtle message is: Pull up your pants, because "2 inches" really just means "too annoying."
Why do I suggest it singles out young people? I'm not ascribing any evil motive to law enforcement. Rather, as a society, we won't expect the police to ticket a plumber crouched over at work, accidentally revealing his tighty-whiteys. We'll expect them to target teens who show underwear as a fashion statement.
So, the underlying legal question arises: Can the government even outlaw saggy pants in the first place?