When someone at a United Federation of Teachers meeting put laminated photos of a female union rep who opposed UFT President Mike Mulgrew in men’s urinals with the words “PISS ON MY FACE!,” Mulgrew said he would have the disgusting act i nvestigated.

Four months later, the UFT claims it can’t flush out the culprit — and pissed-off critics call it a cover-up.

“Regrettably, it is not possible to discern the identity of the person that placed the placard in the urinal,” Elizabeth DiMichele, a lawyer the UFT hired to conduct a probe concluded in an Oct. 8 email reviewed by The Post, saying she was preparing a final report. 3

Amy Arundell, the targeted union rep, and her supporters blasted the probe as a sham, saying it aimed to shield rather than expose the offender.

“The investigat

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