Laura H. Kahn, researcher, Program on Science and Global Security, Princeton University

If the Assad regime has nothing to hide, then it should allow UN inspectors to investigate the allegations. The reports seem to corroborate the use of chemical weapons against men, women, and children. If true, then the international community must hold the perpetrators accountable for violating international prohibitions against the use of such weapons. If it doesn't, then international agreements proscribing use of these weapons will be meaningless.