"Research into the journals likely will have to wait until the Turpins' criminal case is resolved, and only if the writings are released to academics, Pennebaker said.
In the meantime, the journals will also have tremendous value for the criminal investigation, even though they may not be admissable as evidence in a courtroom, said Laurie Levenson, a criminal law expert at Loyola Law School in Los Angeles.
Investigators who are attempting to interview the children, a delicate process, could start with the journals, asking about entries that imply abuse, Levenson said. Additionally, if either of the parents were to testify in their own defense, prosecutors could use the journals to cross-examine them.
And finally, if any of the children testify, they could use the journals to refresh their memory on witness stand, much the way a police officer reviews a report before testifying about an old crime, she said.
You cant cross examine a journal, you have to cross examine the children, but they are a still a good starting point," Levenson said. "And frankly, they may be enough to persuade a defendant that they dont want to go through a long trial here."