Just to add to masalamas post, 100% breath analyzer tests for all flights, and with a tolerance of 0%. If the alco sensor shows any percentage above 0, you are treated as a positive case. I really wonder if the same parameters are followed in any other country. I am sure the results will be similar in any other part of the world, if the same benchmarks are set.
As regards Air India, the airline is beyond any rescue. The government of India can pump in as much public money as they want, the end result will be the same. The same staff, the same attitude. Well, some things never change.