Snape bowed his head slightly in response to Harry's last words; but his expression was sombre when he met Harry's gaze once more.
"Do not thank me prematurely," he replied quietly. "As an expert witness, the court may wish to verify my testimony via Veritaserum. I have no intention of attempting to circumvent such measures.
If I do not find any evidence of memory modification, I will not pretend that I have found it."