Michael Chertoff, former federal appellate judge and former Homeland Security Secretary, has an op-ed in today's WSJ defending the use of undercover sting operations:
The use of undercover operations and informant stings will become more important with the growth of homegrown terrorism. Susceptible individuals who have little or no contact with hardened al Qaeda operatives nevertheless now have easy access to al Qaeda ideology via the Internet to fuel their radicalization. We cannot only prepare for al Qaeda terrorist operatives from foreign nations. Instead, we must use intelligence-gathering and analysis to identify and prevent growing threats from within.
He mentions Antonio Martinez, but not Mohamed Mohamud.