1) Tranquilizer darts aren't magic. Without calibrated dosage, the effects can range from nearly nothing to fatal. [1] 2) Tranquilizer darts work against unpr

1) Tranquilizer darts aren't magic. Without calibrated dosage, the effects can range from nearly nothing to fatal. [1] 2) Tranquilizer darts work against unprotected skin, not heavy clothing and certainly not against body armor. 3) Where would one get a robot armed with a tranquilizer dart launcher? They're not exactly off the shelf items. [1] https://www.quora.com/Why-dont-cops-use-tranquilizer-guns-when-shooting-someone-as-a-way-to-control-the-situation-without-definite-consequences https://www.quora.com/Why-dont-cops-use-tranquilizer-guns-wh...