Tranquilizer dart
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A tranquilizer dart is a dart-like projectile containing a sedative which is injected into the target as if through a needle or syringe when the dart strikes the target. Tranquilizer darts are fired from a capture gun or a crossbow at wild animals in order to sedate them for the purposes of study or transport. They are not included in military or police less-than-lethal arsenals because no drug is yet known that would be quickly and reliably effective on humans without the risks of side effects or an overdose.