They can only seek reimbursement for costs caused by the crimes for which she was convicted--lying to LE. They don't need to rely on any statements JB made, because they have the convictions. IMO they did not spend much time or money discovering that she lied about the specific things listed in the indictment--they figured out those lies in less than 24 hours--but HHJP seems disappointed in the result of the trial and might allow more costs than he normally would.
AZ I understand what your saying, bt LE didn't say it was a homicide until Nov. I believe. Yes, they knew she was lying, but it wasn't proven in court yet, so can't they charge her costs at least until Nov. 2008 or Caylees remains were found?