The CAA rules state that which drugs to test for should be decided by the airline or air traffic control company alongside a medical advisor. Conditions that will influence which drugs to test for include:

  • The location of the safety critical workers
  • Employment
  • Residence
  • The availability of particular substances
  • Accepted regional practices and
  • Availability of medicines, certain types of food and drugs
  • Cultural practices and the diversity of the workforce [12]