However, they are attached to the IR forms, so a broadly-worded Request for Production should yield both. The second group include some or all of that group, and managers of those departments. IR forms also show the date and time that an event occurred, and when it was discovered. These dates may be separated by days or even weeks. The form will also show when it was reviewed by a supervisory person, again possibly days or weeks later.
Some reports lag as much as six months.
In this case, the first cause was the poor hand-writing. Procedures that were not followed may also be mentioned, i.e. failure to clarify the unclear order, and failure to know the normal dosage of this drug. Note that causes and participants may be identified in either or both the IR and investigation form. In this case, various departments were involved. From the hospital, they were the Pharmacy, the ED, and an intensive care area, if that is where the med was administered.