Pain is the greatest motivator of all, and a painful death tops the list.
Instead of using poison might I suggest corporal punishment as a little more humane idea first? Get caught twice and after a fair trial and conviction give them 10 true lashes out back of the courthouse. While they are laying there writhing in pain you look them in the eye and explain that upon the next conviction it will be 20 lashes.
Recidivism will be down really quick for 90+ percent of users I bet, and a whole lot of first timers will be too scared of the consequences to try it.
Hmmm, good idea but the libs would whine about “Cruel and Unusual Punishment”...
They might drag that one out. But me, I'm wondering if ya'll are working through some issues of your own wanting to administer spankings and all. Do you get to wear a leather gimp mask in your torture porn?