“...I’m thinking a weapon that’s much more effective than a taser...only provide them other options when on the street.” [JesusIsLord, post 14]
“...There are tranquilizers that can instantly incapacitate...one size does not fit all. A tranquilizer dose and even a taser setting high enough to kill a 120 lb person might not even phase a 300 lb person. This seems to be the main obstacle in using a tranquilizer as a weapon...” [JesusIsLord, post 16]
Whoever fed you the information has no idea what they are talking about. No such chemical exists. And the situation is more complex than administered dose in mg/kg: physical fitness, emotional state, prior activity level, nutrition, are just a few of the variables.
Any drug that will incapacitate a suspect in a very short time might kill just as quickly.
The same applies to bullets. Though it’s endlessly argued among enthusiasts, there is no amount of kinetic energy that will wound or incapacitate a suspect without killing them. “Stopping power” cannot be quantified; one reason the military establishment is explicitly forbidden to use it when drafting statements of operational need.
A passionate desire to have all the sciency stuff work out so that you can have your cake and eat it too does not guarantee success. Weapons design and development takes a fair amount of time; so many different constraints apply that full success is never possible.
I had come to the same conclusion: "A tranquilizer dose and even a taser setting high enough to kill a 120 lb person might not even phase a 300 lb person.".