Check out the link to Vice.com at the bottom.
VICE sent a guy to Columbia to investigate the effects of a drug known to locals as ‘Devil’s Breath’ which reportedly can render a person entirely suggestible, essentially they will do anything they are asked to do. And yes what you just thought of is one of the things it is used for.
Although the documentary doesn’t get very scientific, the stories told by interviewed locals make this interesting enough. Scopolamine as the drug is also known as has an air of mysticism about it with roots in ancient rituals. Enjoy.