The Arlington Sun-Gazette
posted an article yesterday about Mr. Krulfeld's reinstatement as Director of Student Activities (including service as AD). They claim in the lede that:
"Mike Krulfeld recently returned to his job as director of student activities at Yorktown High School, having been put on administrative leave in early June for reasons that were not made clear to the 24-year employee of Arlington Public Schools or the public that rallied to his cause."
Read between the lines. Mr. Krulfeld almost certainly knows who sparked the investigation and what they claimed, and almost certainly feels comfortable that the allegations were nonsense. But as an employee of APS he can't go after any accuser/s for making frivolous allegations because it's APS that decides how to handle such matters. That is, unless Mr. Krulfeld wants to retain his own counsel and go after the accuser/s as an individual.
Obviously he doesn't want to roll the dice that way. It would cost a bundle to walk away from APS's umbrella to pursue charges for defamation when nothing was published and no allegations are even public. But if non-SunGazette, non-ArlNow media gets interested and actually manages to uncover both the allegations and their plausibility without being snowed, that would go the furthest to salvage Mr. Krulfeld's reputation without Mr. Krulfeld defying APS. Of course, it's likely not in the interest of APS nor the accuser/s to lay out the full circumstances (especially if there's some sort of confidentiality agreement). So Mr. Krulfeld has to live with people asking "why was he on administrative leave?" when he's pretty sure but can't respond.