little harsh on beyonce yesterday in the skinny. we ll share some good beyonce news this morning. i don t think she s really worried. she s doing her thing. but first, some very telling words from those who left syria s regime. one defector is saying, the revolution will be victorious. another is confirming the worst fears about the regime s potential use of deadly chemical weapons. his words come amid some big rebel advances. reporter: the rebels have taken the fight to syria s biggest cities, battling assad s strong holds, his palace in damascus, while fighters have overrun one of the largest military bases outside the city of aleppo. american officials fear the likelihood of assad using chemical weapons is rising. they say they have proof they ve been prepared. we went to meet a man who shares those fears. driving along a dark back
those fears. driving along a dark back country road near turkey s border with syria. he told us that until 2008, he was a chief of staff in the chemical weapons program. he said he worked on the defense side, in charge of preparing troops for dealing with attacks and safety equipment. what specific chemical weapons does the assad regime have? he said they have mustard gas, along with a highly toxic nerve agent, vx, sarin and tabun. the regime has started to fall and deteriorate, he argues. it s highly possible assad will start using chemical weapons to kill his own people. i think it s a last-ditch effort and one they don t want to use but are considering it. reporter: if the regime crumbles, the u.s. fears the weapons could be transferred to hezbollah or fall into groups like al qaeda. knowing what you do about the facilities, the security, do you worry that these weapons will fall into the wrong hands? yes, he said.