Professor Reynolds takes a deep breath, and -
"I, Fay Reynolds, Professor of Defense Against the Dark Arts at Hogwarts, registered Legilimens certified with the American Board of Forensic Magic, affirm that upon thoroughly scanning the patient, I can find no evidence of current, ongoing mental influence, and that I can find no evidence of Occlumency or memory modification that might have been used to hide such influence, stretching back to the natural onset of childhood amnesia." Pause. "There was evidence of past mental influence in the form of possession, as reported by the patient. I can find no evidence that the possessor make any direct modifications to the patient's mind, and the patient's memories reveal no attempts at verbal manipulation. The possessor's control of the body was absolute, which the patient experienced as watching the body act under another's will. The patient was aware of at least some of the possessor's thoughts, though I cannot confirm whether the possessor was using Occlumency at the time to hide or change their apparent thoughts."
A longer pause.
"The possessor did not identify themselves by name. However, they gave several fairly definitive clues to their identity, assuming that those clues were not intentionally manufactured. They had clear memories of the attack on Godric's Hollow that occurred on October Thirty First, Nineteen Eighty One, which arose as they considered a difficulty they were having with laying a spell on another. They referred to a known and convicted Death Eater as 'my most loyal servant,' likely in response to a thought by the patient. The cadence of their thoughts matched my personal experiences of a specific wizard's speech patterns. The way they used their magic matched my experiences of that same wizard, as well. I would like to enter into the record a professional observation that thought cadence and magic usage patterns are difficult to mimic, even by immensely skilled Occlumens, making deception in this matter unlikely."
"As such, my professional conclusion is that the spirit's most likely identity is that of Lord Voldemort, the leader of the Death Eater movement."
Auror Shaklebolt has gone very still, mouth thin. Professor Reynolds presses her hand to her forehead, thinking -
"The spirit did not directly reveal much of what happened in the time between Voldemort's disembodiment and the possession, nor of the spirit's plans for the future. The spirit indicated that they had been possessing the late Professor Quirrel since the beginning of the school year. The spirit's thoughts about the unknown circlet indicated faith in its powers, but did not indicate the nature, exact powers, or origin of the circlet. The spirit believed that the circlet would erase its victim's personality, replacing them with a copy of the spirit. The victim's memories would be sectioned off, the spirit's memories - possibly only up to a certain point - placed centrally within the mind. The spirit had never before used the circlet to this purpose, though, and they observed that it was not functioning as originally intended. The spirit was unsure whether that was because of a miscalculation on their part, or if ritual protections laid on the victim were interfering."
"The spirit indicated confidence that they could not be prevented from obtaining their goals. I am uncertain if these 'goals' refer to the short term or the long term."
She frowns, more, then, almost reluctantly:
"I need more time to sort out everything I observed. I understand and accept that this means that the Obliviation I have agreed to, for the sake of the patient's privacy, will cover a more significant time than initially believed, possibly amounting to several days. I do not intend to record or relay anything I observed within the patient's mind not relevant to the case, and I am willing to take a magically binding oath affirming this, as well as affirming the truth of what I have relayed."