Historian Paul Russell Cutright wrote a detailed rebuttal of the murder/robbery theory, concluding that it "lacks legs to stand on". He stressed Lewis's debts, heavy drinking, possible morphine and opium use, failure to prepare the expedition's journals for publication, repeated failure to find a wife, and the deterioration of his friendship with Thomas Jefferson. This refutation was countered by Dr. Eldon G. Chuinard, (physician), who argued for the murder hypothesis on the basis that Lewis's reported wounds were inconsistent with his reported two-hour survival after the shooting. This theory has been challenged by Dr. David J. Peck (physician), with support from Forensic Pathology and Trauma Surgery. Leading Lewis scholars Donald Jackson, Jay H. Buckley, Clay S. Jenkinson and others, have stated that, regardless of their leanings or beliefs, the facts of his death are not known, there are no eyewitnesses, and the reliability of reports of those in the place or vicinity cannot be considered certain. Author Peter Stark believes that post-traumatic stress disorder may have been a contributor to Meriwether Lewis's condition after spending months traversing hostile Indian territory, particularly because travelers coming afterward exhibited the same symptoms.