In India, the breath analyzer tests are done for all flights originating out of India for all domestic airlines. The same has been happening for the last couple of months.
The legal limit in India is 0.00% as opposed to some other countries.
Though 57 pilots getting caught on a BA check sounds high for 2 years, it would be a good measure to know how many total BA checks were carried out during the entire 2 years. I am sure as a percentage the figure will be really low.