Pharmaco-intelligence

In Afghanistan, the CIA has been getting information about the Taliban from local chieftains in exchange for a few little blue pills. I don't like it... it reminds me too much of the British giving the Chinese opium at the turn of the century. Plus, don't you need a prescription for Viagra? Isn't that illegal distribution of drugs? (But I guess it's better than giving them weapons and money - which has normally been the case).