For all EU AOC holders and their pilots ,EU Ops is the law .
So on a Fitness To Fly ,EU OPs 1.085 (d) makes good reading both on the issue of alcohol,meds (OTC & Prescription) but most important Fatigue .
1.085 (d)
crew member shall not perform duties on an aeroplane:
while under the influence of any drug that may affect his/her faculties in a manner contrary to safety;
following deep sea diving except when a reasonable time period has elapsed;
following blood donation except when a reasonable time period has elapsed;
if applicable medical requirements are not fulfilled, or if he/she is in any doubt of being able to accomplish his/her assigned duties; or
if he/she knows or suspects that he/she is suffering from fatigue, or feels unfit to the extent that the flight may be endangered.
1.420 Occurence Reporting
Incident reporting. An operator shall establish procedures for reporting incidents taking into account responsibilities described below and circumstances described in subparagraph (d) below.
1. OPS 1.085(b) specifies the responsibilities of crew members for reporting incidents that endangers, or could endanger, the safety of operation.
So under both the SMS and EU OPs both the Operator and Individual pilot are mutually responsible ,so tinkering with your tachograph or improving your handicap be it at the planning or operational stage will be patently obvious when the NAA or AAIU come a calling .
"MUM/DAD why are we not able to go on holiday any more! "
"Because HE/SHE lost their Job/licence !"
Personally ,I believe that being forwarned should be sufficient ,although if you work with a LCC or non -unionised operational environment ,my best wished are with you .