Lethal Intent Lurking in the Shadows

Is there anyone in this world you hate so much that you wish you could kill them?

There is a drug that can kill anyone you hate if you give it to them. The symptoms are exactly like sudden cardiac arrest, and with today's medical technology, it is impossible to detect.

What's more, the drug takes twenty-four hours to work once it's in the body, so there's no need to worry about being suspected.

Would you want a drug like that?