They only told the authorities because the authorities called them in AFTER Oprah gave them a letter one of the daughters had hid in a book detailing the abuse that was lent out in 2002.
Jimbob thought he was outsmarting the cops when he got everyone to say the abuse ended by 2003 in time for the 3 year Statute of Limitations to run out.
Link? The Oprah interview was in 2006. JimBob told the trooper in 2003. The tipster we can presume is very possibly somebody one of the parents had told. True the trooper took no action but was Jimbob supposed to keep telling cops until he found one that would turn it into a media circus?