Is Israel using phosphorus shells against Gazans?

Human Rights Watch says it’s quite possible but can’t get to Gaza itself, where a doctor claims he’s seeing burn patients with symptoms consistent with phosphorus burns.

Israel’s response?

Military spokeswoman Maj. Avital Leibovich refused to comment directly on whether Israel was using phosphorus, but said the army was "using its munitions in accordance with international law."

Well, Maj. Leibovich can say that because Israel has never signed an international convention — on the books — that bars phosphorus shells for being used on the battlefield for anything other than illumination purposes.