anti-doping agency, travis tygart. mr. tygart, i wonder, what was the best evidence that the u.s.a.d.a. had that lance armstrong had doped? >> really it was the totality of the evidence. that made it so compelling and overwhelming. >> pelley: you say the totality of the evidence. did you have eyewitnesses, for example? >> we did. we had a number of eyewitnesses, confidantes who have never before come forward with information. we had analytical data. >> pelley: armstrong called your investigation a witch-hunt. >> yeah. i mean, it's a refrain we've heard from others who have been caught using dangerous performance-enhancing drugs to cheat sports so it's one we're familiar with. but there's absolutely no basis to it. we make our decisions solely on the evidence to bring a case or not bring a case. >> pelley: armstrong was no longer competing in cycling. he'd retired from the sport. i wonder why you felt it was important to pursue this now? >> you know, look, i think it's a sad day for all of us who love sport when one of our

travis tygart the head of the usada said he will be stripped of his titles. >> given he's chosen not to contest it's a legal fact that he's now disqualified and has a permanent ban from sport competition. >> reporter: they say the case against armstrong including ten former teammates ready to testify against him. last year, teammate tyler hamilton told "60 minutes" he saw armstrong used banned substances. >> i saw it in his refrigerator you know. i saw him inject it more than one time. >> reporter: armstrong continues to maintain the innocence and calls the investigation against him an unconstitutional witch hunt. >> reporter: armstrong says he is quote turning the page and will no longer address the issue. alexis christoforous, cbs news, new york. >>> coming up, howard has the weekend forecast. >> and what we've got filtered sunshine today jc. we could have just bona fide showers and rain over parts of the weekend. ill tell you why it's going downhill and allergy count just came in a few minutes ago from sue and her colleagues over there at the army centralized allergen extract lab.

. >> reporter: travis tygart, head of usada, says the case is strong with more than a dozen witnesses. >> we don't make any decision to bring a case lightly. the evidence we've said before in this particular case was overwhelming. >> reporter: yet the sports governing body, the international cycling union, says it's not doing anything until it gets a full explanation from usada. david, is this fair? >> well, it's the usual process. >> reporter: david epstein is a senior writer at "sports illustrated." >> usada also had blood tests from 2009 that they say were indicative of blood manipulation. so i think they would have contended, had this gone forward, that that is a positive test. >> reporter: it's armstrong's personal battle against cancer and his foundation symbolized by those plastic yellow bands that have made him an icon. live strong officials say online donations today were 30 times greater than yesterday. >> i think our supporters and namely cancer survivors and their family members feel a debt of gratitude to lance, ultimately his legacy is going to be about what we accomplis

usada ceo travis tygart says armstrong used performance enhancing drugs to win and reportedly had 10 former teammates prepared to testify. >> given that he's chosen not to contest, it's a legal fact that he's now disqualified and has a permanent ban from sport competition. >> the anti-doping agency expects the international cycling union and the tour de france organization to go along with its decision, but both groups have yet to make an announcement. the retired cyclist denies ever taking performance enhancing drugs, but last year former teammate tyler hamilton told 60 minutes he watched armstrong use illegal blood boosters. >> you saw lance armstrong inject epo? >> yeah. like we all did. >> armstrong could have entered arbitration to fight those charges and his decision to quit surprises former teammates and competitors. >> i definitely would have expected lance to fight all the way to the grave to clear his name. >> for his part armstrong says he will no longer drats issue regardless of the circumstance. -- address the issue regardless of the circumstance. armstrong could lose hi

. >> brown: and usada chief travis tygart, calling it a "sad day," said: "this is a heartbreaking example of how the win-at-all-costs culture of sport, if left unchecked, will overtake fair, safe and honest competition. armstrong now faces a lifelong ban on competing, and being stripped of past awards-- including his seven tour titles and a bronze medal he won at the 2000 olympic games. we get more now from david epstein, a senior writer for "sports illustrated." david this has gone on for a very long time but fill in what is known now about the evidence that the u.s. anti-doping agency seems to have on armstrong. >> well, for the u.s. anti-doping agency of course was paying very close attention to a federal department of justice investigation that was sort of spurred in the spring of 2010 when lance armstrong's former teammate floyd landies who was stripped of a tour de france win sent an e-mail to cycling observations saying look, here's how we were doping. here is how the program and the systems worked. and that launched a federal law enforcement investigation that was eventually dropp

especially travis tygart. >> given that he has chosen not to contest, he is now isqualified and has a permanent ban from sport competition. > reporter: in june, usada bought charges against armstrong nglying not on a positive drug from severvidence that reportedly included testimony from several former teammates. rugstrong filed suit in federal judgeto stay away from drug isbitration. on monday, a judge dismissed the .uit. >> we have nothing to hide. as know that. >> reporter: armstrong has long and vehemently denied he used performance enhancing drugs of tny kind. citing the fact that he never 20iled more than 500 drug tests. but in may of 2011, armstrong's former teammate, tyler hamilton, told "60 minutes" that he sa use epo, saw armstrong use epo, a banned blood booster. >> i saw it in his refrigerator. i saw him inject it. on more than one time. >> you saw lance armstrong inject epo? >> yeah. >> lans we all did. >> nike points to the continuation to support lance lancee lance armstrong ed ndation, a foundation that lance created to serve cancer s. vivors. >> armen, stay with us. p

travis tygart, director ejecutivo de la usada, dejÓ en claro que armstrong es suspendido de por vida, retirado y al filo de los 41 aÑos y esta tarde la agencia antidopaje de estados unidos confirma su descalificaciÓn de todos las competiciones en las que participÓ desde el 1 de agosto bien vamos con lque se viene para la mls este fin de semana. impact de montreal recibe maÑana al dc united en horario especial de las 4 de la tarde, el partido esta programdo a jugarse en el saputo stadium. ambos equipos estan en la conferncia del este, dc united es quinto, esta en zona de clasificacion con 40 puntos y el impact de montreal es sexto con 36 unidades y con tres partidos mas que dc united. vamos ahora con el futbol americano, con la nfl.anoche en baltimore, los tres quarterbac ks de los ravens completaron al menos un pase de anotacio Ón para llevar al equipo a un abultado triunfo 48 a 17 sobre los jaguars de jacksonville en la semana tres de la pretemporada. el titular joe flacco fue el gran ganador de la noche, completando 27 de 36 intentos para 288 yardas y dos anotaciones, ademÁs de cond