Highly unlikely that it was after rats and chickens. Ophiophagus Hannah, the Latin name of the king cobra, translates literally to snake eater because that's what they normally eat.
Sigh! When will they ever learn?!
The war on drugs can't be won as has been demonstrated by numerous countries decade after decade! All it does is put a temporary dent in the supply and waste a <deleted>load of tax money!
Legalization is the only way to go!