NEW DELHI — India’s parliament has approved a bill to amend the Chemical Weapons Convention Act to forbid the transfer of specified toxins to and from any country not party to the convention. “The Chemical Weapons Convention (Amendment) Bill, 2012, part of India’s international obligation, seeks to amend the Chemical Weapons Convention Act, 2000, which was enacted to . . . help prohibit the development, production, stockpiling and use of chemical weapons and on their destruction,” says a senior government official.