For Iranian operatives to be so obvious while operating inside the United States is not a new thing, as illustrated by the case of David Belfield, also known as Dawud Salahuddin, who was hired by the Iranian government to assassinate high-profile Iranian dissident Ali Akbar Tabatabaei in July 1980.
Intelligence sharing is the most unsatisfactory aspect of Indo-US counter-terrorism co-operation. Before 26/11, the U.S. had hardly ever shared with India any worthwhile preventive intelligence. David Coleman Headley had been planning an attack on India in collaboration with the ISI and the LeT for a long time. This was known to the U.S. authorities. Perhaps they could have forced Pakistan to restrain their spy agency.
According to security experts, Pakistan-based terror organizations -- with help from Inter-Services Intelligence -- have set up hundreds of terror cells/modules across India. A terror module is a functional unit which includes one or more terror cells. Every cell works independently of the other and the handlers in Pakistan manage these cells without worrying about the Indian agencies. The recurring terror strikes in our country suggests that the Indian agencies does not have the required human intelligence about the numerous cells and modules that operate here.