I have seen a lot of questions on this site asking if someone should report a DUI or an arrest, a bankruptcy, a tax lien, one time marijuana use, etc.... The common theme seems to be that either these clearance holders are not being properly briefed during initial indoctrination training, and not being reminded during annual refresher training, or have selective memory or are choosing to ignore the requirement to report adverse information. With the intense scrutiny on security clearance processes and those that hold clearances, it is at your own peril to ignore the reporting requirements which may result in adverse consequences. In case you forgot what your responsibilities are, I would advise you go to this link to refresh your memory:
The old adage "bad news does not get better with time" definitely applies here.