Penn State officials Gary Schultz and Tim Curley were charged with perjury and failure to report child abuse in early November. To support the perjury charges, prosecutors must show probable cause the two men lied and that the lies were intentional and material to the case. "Even though you've had some fairly celebrated folks convicted of perjury, it's a very tough charge to prove,'' said Edward Ohlbaum of Temple's Beasley School of Law. "You have to have a clear question, an unequivocal answer, and (prove) the defendant knew what he was saying was false.''