Researchers have discovered a new drug in South America. People who are given the drug seem normal in all aspects except that they do what ever they are told to do.
Now, the sinister side of this drug is that people could be told to withdraw all of their money from the bank or even to rob the bank and they would do it. They literally have no power to resist.
But on the positive side of things, it would make for one dandy truth serum. It might even make it easier to hunt down terrorists.
I am sure that the ACLU will fight against such a drug claiming that it interferes with a persons right to lie.