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Please elaborate.

Since I doubt there is actually a law against bringing plastic bags into certain buildings, it sounds like the security guard just misunderstands

In Mumbai, citizens seen to be carrying plastic bags are liable for fine of 5000 INR for first time offenders and up to 3 months prison time.

How do you enforce this? What if I just kept a year-old plastic bag around?

You don't argue with the police.

Doesn't matter if it's 1 y/o or 10y/o. All plastic bags are banned.