Yes, exactly - it's a municipal infraction in San Diego county and the only evidence required is that a ticket was written. You are guilty unless you can prove innocence.
For entertainment, I once fought a $40 ticket that had been given to me due to a chalk mark remaining from my previous parking spot. With a closed-door process and phones that are never answered, it took great persistence. Finally, in arbitration six months later, they didn't believe my side of the case even though they admitted this mistake happens "all the time."
But it was instantly dismissed after I was asked what I was doing during that time. They couldn't believe anyone could possibly spend more than 2 hours at a coffee shop, a skill that I have tuned to a fine art.