Being generally familiar with criminal procedure in federal court, I respectfully note that:
1. Osbon's attorney and the prosecutor reportedly entered into a stipulation that Osbon "is not now suffering from a mental disease or defect which would interfere with his ability to meet the legal criteria of competency to stand trial." Osbon agreed to that stipulation in open court.
2. One key word in that stipulation is "now." Being competent to stand trial now is a different question than whether Osbon was competent at the time of the incident. While in custody, he may have been treated with medication or perhaps ceased ingesting something (such as a nutritional supplement) that triggered his symptoms.