Acquittal because of tainting (witness intimidation, jury tampering, or perjury) would also allow retrial. They also may be used to help resist or indicate tampering or pilferage. Nickell's legal team sought a mistrial on grounds of jury tampering and judicial misconduct. Prado's claimed "illicit prosecution tactics, which include witness tampering and deliberately ignoring evidence". They were subsequently acquitted on charges of manslaughter and evidence tampering. Concerns about jury tampering through intimidation by defendants were also raised. They were charged with witness tampering and destruction of evidence. Koenig found no evidence of tampering or manipulation and deemed all documentation authentic and contemporaneous. Critics point out the possibility of cheating the system by odometer tampering. In March 2008, D'Elia pleaded guilty to witness tampering and money laundering. She was acquitted of witness tampering and gang assault. Dr. Ritcha Saxena was suspected of tampering with the samples. Ross Young's conducted an investigation into possible external tampering. Questions were raised concerning issues ranging from witness tampering to the planting of evidence. Hoffa was eventually jailed for jury tampering.