luis rueda spent 28 years in the cia, mostly as an agent and station chief in the field, including in the middle east and south asia. his last assignment was dwep tee director for counterintelligence at the cia's counterterrorism center. where he dealt with double agent operations and security. he retired on january 1st on the heels of the foiled christmas day airliner plot and the deadly double agent attack on a remote cia outpost in afghanistan. i spoke to him earlier today at his home on capitol hill a. thank you for being with us. >> thank you for having me. >> warner: osama bin laden or a voice saying he was osama bin laden this weekend hailed the christmas day bomb attempt, the same attack that al qaeda had already taken credit for. now one, do you believe this is osama bin laden, but more importantly what-- if so, what does it is a about how al qaeda is operating today? >> it's always hard to identify whether it is him or not. but as far as we know there has never been a false osama bin laden tape. so the odds are that it probably is him. i think what it tells us about al qaeda

. >> warr: luis rueda, thank you. >> thank you for hing me. >> margaret gets a differe view fm a former cia agent >> woodruff: margaret ge a different view from a rmer c.i.a. age later this week. >> ifill: next, very big fish storabout the battle among midwestern states over arowing threat to e great lakes ecystem. newshour correondent tom bearden report big one, big one. >> reporter:hese are the invars. large sh that leap high out of the water whe distushed. they are cald asian carp. the chese have been gring them for food for a thousand years. but to americans, they a an iasive species, destroyinghe habitat of native fisin the mississippi river and s tribuy tears, all the wa from the gulf of mico to chicago. the fear that they will do thsame to the great lakes has set state against state with michigan filing st along with fivother great ke states to force linois and the federal gornment to stop these fish in their tracks >> this is a big head rp right here, anthis is a littleuy. i have colcted them on the illinois riv where they easily are twicehat length, theyould weigh upwards upwar