when we went to see dr. mata, he refused to show his face. maintained his innocence. >> did you abuse your patients? >> no, no. >> you deny that? >> i have to -- i'm not going to make any comment because you twist things -- >> i'm not going to twist things. you're hiding behind a door. i want to ask you, did you violate your oath? did you violate those patients? >> i'm going to make no comment on that. >> reporter: from the time of his arrest it took the california medical board three years to revoke dr. mata's license and he's now eligible to reapply for it, although he says he has retired. >> we found that there is a desire to try to return doctors to practice if we can. doctors are needed. you know, it costs a lot of money to make a doctor. so there's a sense that we want to try to rehabilitate them if possible. >> even after'ses th allegation are substantiated? >> correct. those who are in charge of licensing physicians have a belief that they can be safely returned to exam rooms. >> doctors are about healing and helping and he did the ex

when we went to see dr. mata at his california home, he refused to show hifa you're hiding behind a door here, i want to ask you, did you violate your oath, did you violate those patients? >> i'm going to make no comment on that. >> reporter: dr. mata's medical license was revoked, but he is now eligible to reapply for it. and david, the investigation found that all too often, state medical boards, which issue the medical licenses, seem more concerned with protecting doctors than protecting patients. >> this is going to alarm a lot of people. brian, thank you. >>> there is still much more ahead on "world news tonight" this wednesday. the popular tv host and former miss america filing a major lawsuit tonight. gretchen carlson's claims against the ceo of fox news, accusing him of sexual harassment. tonight, his response just in. >>> there is also news this evening about the american student killed in rome. his final hours. and now, his parents' emotional and unexpected meeting with pope francis. >>> and newly relea

when we went to see dr. mata, he refused to show his face but maintained his innocence.no. >> you deny that. >> i have no -- no, i'm not going to make any comment on that because you twist things. >> i won't twist things. you're hiding behind a door. i want to ask you, did you violate your oath? did you violate those patients? >> i am -- i'm not going to make no comment on that. >> reporter: from the time of his arrest it took the california medical board three years to suspend his license and he's now eligible to reapply for it although he says he has retired. in fact, of the 2400 doctors, sanctioned for sexual abuse of their patients half of them, half of them have been able to keep their licenses to practice. george and robin. >> all right, brian. >> that is just stunning. >> it is. >>> let's go over to michael. >> george, coming up on the big board, the major olympic security concerns and a new scare in rio's waters just a month before the games begin. >>> plus, this video of a man riding a moose sparking a big investigation. >>> and could we be heading for an all-wi