AFAIK, drug testing is only mandatory for those who work on the airplane--such as,pilots, flight attendants--or who work on the airplane--English language being difficult--such as, mechanics, fuel truck drivers, baggage handlers, etc.
That is not to say that JetBlue does not have drug testing for office employees. When I worked at a major oil company, even techies like me--I was a Systems Analyst--were subject to random drug tests because we had to go on occasion into highly restricted areas--such as oil refineries.