This is a super tricky one. So many uncertainties.
I've had a few cases that were similar but different that could possibly be helpful here....
One case I had where a previous romantic connection reported accusations as a means to do damage to the pilot and it did ultimately trigger an investigation that involved medical, which I assisted with...but ultimately completed exonerated the pilot and he received an eligibility letter with no SI or need to participate in HIMS.
I've also had several cases where applicants disclosed use of psychedelics or had instances where they landed in an ER due to some
past drug use due to intoxication. Most of these cases that were a one time incident required a personal statement, medical records and then possibly a SAE (substance abuse evaluation) to confirm they did not in fact carry a true substance use diagnosis. If that appointment went well the process typically ended there, with or without some possible no notice drug testing.
Not sure if any of that is useful...