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america's fentanyl crisis. we go inside a d.e.a. lab with the head of the agency to find out where the deadly synthetic drug comes from and how easy it is for teens to buy pills. you're saying that teens can get these drugs just as easy as they can order something through uber eats? >> there's no question. >> o'donnell: american innovation. how u.v. light could protect against the next pandemic. and finally, a world war ii veteran lost to history finally getting a hero's good-bye. ♪ ♪ ♪ this is the "cbs evening news" with norah o'donnell, reporting from the nation's capital. â™...

>> reporter: a uniform that waited in his closet for 77 years. dednam served in a segregated military during world war ii. .but his service was all but forgotten at the time of his death. >> i want to make sure that he had a proper sendoff. >> reporter: seated next to the war hero's casket was his neighbor, deshaun hicks. the two had a 10-year bond. >> he was like a grandfather to me. he always talked to me about goodwill, go intent, having compassion for others. >> reporter: he had just turned 100 years old. >> yes. when he turned 100 years old, i was there to knock on his door and say, "cong...