This case was so easy to break campus police officers broke it--from another city.
They didnt break the case, they thought something was wrong with the two daughters. They most likely suspected a possible case of familial child abuse. The parole officer is the one that determined that something actually was very wrong, and the police department were the ones that determined the true situation.
If the parole officer had brushed the campus cops off, or if he had bought the Garido's story, Jaycee would be back in the backyard right now and most likely her conversion into Allisa Garido would have been complete forever. She would have been on the radar screen as Garido's daughter and no one would have questioned it again.
The whole situation was the most important crossroad in her life, and the path she ended up going down was largely a result of the decisions made by the parole officer. It could have very easily gone the other way if he hadn't been doing his job.