Come here, man. I see that you are poor. Here are forty gold coins. Let me have a shot of poison, something that works so fast that the person who takes it will die as fast as gunpowder exploding in a canon
I have such a poison but it is against the law.
Look, I need this poison my life is a mess! And there's no law to make you rich, so take this the money give me the poison.
Fine! I need the money. I will have you know that I don't want to do this.
I'm paying your need and not your conscience
Mix this with any liquid and has the strength to kill someone with the strength of 20 men.
Here is your gold, which I may argue is worse poison to your soul than that outlawed poison. I've sold you the real poison go buy bread and get fat!
This is no poison but medicine and is going with me to Juliet's grave where I will use it.