There are way too many variables involved with a tranquilizer dart to be effective as a less lethal option on a human. Different body weights, different tolerances to a fixed dose, different interactions with drugs or alcohol already consumed by the target, and different absorption rates into the body depending upon where the dart hit. Darts are fine if you need to sedate a wild animal because you have the luxury of being able to wait indefinitely or use another dart if needed, and if you accidentally overdose the animal and it dies...its an animal. Dead animals don't file wrongful-death lawsuits.Is there a reason why cops dont just use tranquilizer guns in certain situations? Obviously most situations would require a real gun, but some of the "questionable" shootings that make it to the news seem like they couldve been avoided. For example, several cops surrounding an unarmed crazy man, or same situation but the guy has a knife...just seems like tranquilizer guns would be perfect for this type of situation where there are multiple cops with real guns standing by just in case. Would prevent a lot of law suits if nothing else...