No I covered this in an earlier thread where I cited official medical documents indicating therapeutic blood levels of fentanyl and the autopsy report and have shown before that while his levels are high they are within the range for people prescribed the drug at the higher end of dosage.
While it is true it would have the potential to kill someone if it was their first time taking the drug for people prescribed it to manage pain for years on end the dosage and blood levels found are not uncommon.