As a lotnof others have said, because it’s unreliable and dangerous essentially.
It wasn’t tranquilizer darts, but the Russians tried to do a “knockout gas” thing during a hostage crisis in 2002. They knocked all the insurgents out and shot them while unconscious. But, they also [gassed 130 of the hostages to death](https://en.m.wikipedia.org/wiki/Moscow_theater_hostage_crisis)
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