Data Mar Environment News Today

>> reporter: there are many watch lists in government agencies, from the border patrol to the fbi to the cia. and the names of both the older tsarnaev brother and his mother were on one called the terrorist identitys data mar environment, or tide. a low-level list of about 700,000 names. something akin to a first line of defense. there is no active surveillance of people on tide. their names are kept in case they show up in connection with more serious threats. then they may be bumped to the no-...