troopers arresting 62-year-oldod nathaniel sylvester and saying he felt he had no choice. >> i didn't as soon as he took off before hitting multiple cars. i knew i had to chase them down before they kill anybody else. the troopers offer advice in return. don't chase suspects, but we are grateful for the help. for night line in los angeles. >> it was booker t washington who said those who are happy and those who the most for do others. thank you for watching abc news and as always we are online at abc news.com. thanks for the company, america. good night. because my teeth are yellow. these photos? why don't you use a whitening toothpaste? i'm afraid it's bad for my teeth. try crest 3d white. crest 3d white diamond strong toothpaste and rinse...

troopers arresting 62-year-old nathaniel sylvester and saying he felt he had no choice. >> i didn't top multiple cars. i knew i had to chase them down before they kill anybody else. the troopers offer advice in return. don't chase suspects, but we are grateful for the help. for night line in los angeles. >> it was booker t washington who said those who are happy and those who do the most for others. thank you for watching abc news and as always we are online at abc news.com. thanks for the company, america. good night. >> last year, they were headed for the top until one question ended their game. now, these former contestants are getting a do-over. will they be big winners this time around? it's second chance week on "millionaire." [cheers and applause] [dramatic music] ♪ thank you very much. welcome to second chance week on "who wants to be a millionaire." [cheers and applause] today's second-chance contestant learned the hard way--don't say, "final answer," until it's really your final answer. from brooklyn, new york, please welcome back jeanell allen. [cheers and applause] >> hi! >>

. >> reporter: troopers say nathaniel sylvester arrested, suspected of dui. >> i didn't want to get involvedi had to do the right thing and chase him down before he killed or hurt anybody else. >> reporter: highway patrol says they shouldn't chase down suspects but they're grateful this good samaritan was able to do it safely. >>> coming up in the next half hour. taylor swift takes the stand, sharing new details about the alleged groping by a former radio deejay. >>> but first, it's almost daily that we hear how drones are changing the way we live. but we're getting a closer look at how they're used to save lives, coming up next. thanks for loading, sweetie. ...oh, burnt-on gravy? ...gotta rinse that. nope. no way. nada. really? dish issues? throw it all in. new cascade platinum powers through... even burnt-on gravy. nice. cascade. ♪ i want to get away ♪ i want to fly away ♪ yeah, yeah, yeah >> all right, speaking of flying away, we have seen a lot of drone use lately, used for photography, used for deliveries, there's eve drone taxis. >> yes, in dubai. but now drones to save our lives? appa