New Delhi, Aug. 13 -- Air India will introduce mandatory screening of all its pilots for banned substances and medications under current regulations, according to an email to its employees. This comes after its Flight AI2379 from Phuket to New Delhi on August 4 suffered a sudden 300-foot mid-air altitude drop that injured 20 passengers and 4 crew members.

The airline said the testing will go beyond existing regulatory requirements and will come into effect from Thursday, the memo stated.

(This is a developing story. More to come)

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