In case you were wondering what a "Brasher warning" is, it simply refers to ATC notification to the pilot of a possible violation. It refers to an altitude deviation by a Republic captain in 1985, and the subsequent investigation. The FAA adopted a practice of immediate notification (named after Captain Brasher: the "Brasher warning"), though this is certainly not always the case, and failure to issue notification at the time of a violation, as noted, doesn't mean there won't be further investigation.