any way to treat the families of u.s. troops? mold everywhere in their onbase housing. dangerous threat-- north korea suggests it could deliver the u.s. an ominous christmas gift. it kim jong-un ready to launch new missiles? plus an alarming new report: why are sex offenders able to sign up on some of your favorite dating apps. what you need to know. >> they're serial rapists and this is how they prey on their women. >> o'donnell: and our favorite story of the day-- the teacher who never gives up, not a single sick day in 26 years. what we can all learn from her positive outlook on life. >> is the "cbs evening news" with norah o'donnell, reporting from the nation's capital. >> o'donnell: good evening to our viewers in the west. and there is breaking news as we come on the air. a new report tonight accuses president trump was compromising national security to advance his