Pulled over by the cops. So there are phone apps that warn you of Police Officers looking for speeders on the road. But now officials are putting out a warning that you could be doing more harm than good. John rogers explains. When kristi weaver goes out for a drive, she keeps her eyes on the road, and her ears zeroed in on her waze app. Sot kristi weaver, uses waze app if youre someone like me who gets lost everywhere, its a great thing. Waze is way more than a gps. It connects her to other drivers theyll warn her of obstacles coming up like car crashes, traffic backups. Or Police Officers. Q why is it so helpful to know that . Sot kristi weaver, uses waze app im not really a speeder, but its just nice to know. Sot kristi weaver, uses waze app theres always that moment in your heart where its like, oh my goodness, theres a cop ok, make sure all my blinkers are working youre just always on edge. So its just kinda nice to know, all right, look sharp, theres a cop up there. But state trooper kenn watson says Speed Enforcement zones are more important than you may realize. Sot kenn watson, florida Highway Patrol you have to remember by blasting out all this information you may be helping someone who really needs to be behind bars. Dangerous, violent criminals are arrested daily thanks to simple traffic stops. For example Oklahoma City bomber timothy mcveigh, and serial killer ted bundy were both arrested after they were pulled over. Watson says these traffic apps can help these criminals get away. Sot kenn watson, florida Highway Patrol when were making those traffic stops, were pulling bad this is something we have to remember. Instead, watson suggests just obey the speed limit and let Law Enforcement officials do their jobs. That way Everybody Wins drivers like weaver wont get a ticket, and bad guys can get the justice they deserve. Good news for those hitting the pump. Gas prices are dropping. According to the lundberg survey. The average price for a gallon of gas is a dollar 77. Thats over 50 cents less than last year. Prices have not been this low since 2008. Analysts say the latest price drop may be the last unless oil prices go up. Walmart continues to make headlines. The company will start offering fixed shifts and is unveiling other scheduling changes. The move is designed to offer workers more control over their schedules which has been a focus of labor groups. Some groups claim retailers give little notice on shift changes and sometimes exert too much walmart hopes the change will help maintain and motivate workers. The oscars are right around the corner and theres a new game to get fans ready for hollywoods big night. The arcade style game allows everyone to make a run for the oscar as leonardo dicaprio. It features themes and opponents the actor must face on his way to receiving the academy award. The obstacles include avoiding paparazzi and icebergs. For those who dont know thats a reference toward dicaprios hit film titanic. Since its launch. The game has received six thousand plays per a minute. Coming up on wsls 10 at 6. Alan will have another check of your storm team ten forecast. The world a president has to grapple with. Sometimes you cant even imagine. Thats the job. Securing a massive reduction in nuclear weapons. Standing up against the abuse of women. Protecting social security. Expanding benefits for the national guard. And Winning Health care for 8 million children. The presidency is the toughest job in the world and shes the one wholl make a real difference for you. Im Hillary Clinton and i approved this message. Youre looking at a live look of tonight showers taper off with areas of fog possible. Lows in the mid 40s. Monday High Pressure to our north sends an easterly wind our way. That will keep the clouds locked in with a chance for patchy drizzle. Highs in the upper 40s. Monday night cloudy with a few showers mainly late. Lows in the mid to upper 30s. Tuesday a chance for a brief wintry mix in the morning, mainly in the highlands. Otherwise, expect rain with highs in the mid 40s. Wednesday a strong low pressure pulls well to our west. As a result, expect rain with a southerly wind. Highs in mid 50s. 60s are even possible for southside. 1 to 2 of rain is likely leading to flooding concerns with an already saturated ground. Thursday behind the low, its windy and partly sunny with mountain snow. Some snow the highlands and new river valley. The high 50 dropping throughout the day. Friday mountain snow showers continue with partly sunny skies and gusty winds elsewhere. High near 40. Saturday mostly sunny and cool with a high of 46. Sunday plenty of sun with tower cam tonight showers taper off with areas of fog possible. Lows in the mid 40s. Monday High Pressure to our north sends an easterly wind our way. That will keep the clouds locked in with a chance tfocrzle. Highs in themonday night cloudy with a few showers mainly late. Lows in the mid to upper 30s. Tuesday a chance for a brief wintry mix in the morning, mainly in the highlands. Otherwise, expect rain with highs in the mid 40s. Wednesday pressure pulls well to our west. As a result, expect rain with a southerly wind. Highs in mid 50s. 60s are even possible for southside. 1 to 2 of rain is likely leading to flooding concerns with an already saturated ground. Thursday behind the low, its windy and partly sunny with mountain snow. Some snow showers will spill into the highlands and new river valley. The high 50 dropping throughout the day. Friday mountain snow showers continue with partly sunny skies and gusty winds elsewhere. High near 40. Saturday mostly sunny and cool with a high of 46. Sunday plenty of sun with highs in the low 40s. Weather closed captioning acc win yesterday we hear from the hokies. And a little race going on today called the daytona 500. The day went better for some than it did for others. We have all that phongin you cant deal with something, by ignoring it. But thats how some president ial candidates seem to be dealing with social security. Americans work hard, and pay into it. So our next president needs a real plan to keep it strong. elephant noise donkey noise and it did not lack excitement in its return. The Great American race. A 200 lap. 500 mile adventure thats reputation holds more weight than any otherr rookie Chase Elliott. The youngest pole sitter in the history of the daytona 500 at 20 years old. Lived. The 24 car gets loose early in the race and slides across the track to the infield. He finished 37h. Trouble for americas favorite. Dale earnhardt junior. Hes won twice at daytona but would not today. He goes hard into the inside wall. He did not return. Some of the fans not handling that too well. Another wreck. Danica patrick and greg biffle collide. That sends patrick on a wild roththh e infield. And on the final lap. Matt kenseth leading. Denny hamlin goes to pass. Kenseth. His teammate. Tries to block him. But does not. Its hamlin and martin truex junior racing to the end. But hamlin wins with a photo finish. Heres a look at the top 10. Joe gibbs racing doing well here. 3 drivers in the top 5 with hamlin 1st. Reigning sprint cup champion kyle busch 3rd and carl edwards 5th. While Chase Elliotts time in the big leagues today didnt last long. He made his mark in the xfinity ty dillon was on the pole as the Xfinity Series opened its season at the world center of speed. Daytona. The daytona 500 pole sitter Chase Elliott leading the pack on the final lap. Last years 500 winner joey logano on his tail. Logano tries to go outside of elliott. There is contact but elliott holds on for the win. Logano would finish second. Virginia tech has four remaining games in the regular season before the acc tournament begins march 8th. They welcomed Florida State to Cassell Coliseum this weekend. Virginia tech only put up 49 points in each of its last two games. But that was not the case in this one. The hokies went on a 195 run in the second half to secure an 8373 victory over Florida State. The hokies rallied together as a team in the second half and foa way of getting back into the game by means of defense. Williams i dont know that we are necessarily shaking a bag up and hoping something worked it was all things that able to get some consecutive stops there in that run. Allen i think in the first half our intensity on defense was it where it needs to be and we came out in the second half and locked in and all five guys were ready to play defensively. The hokies travel to Boston College on tuesday. The virginia womens team in action today hosting clemson. The cavaliers won 6548. They are now 1513 overall. 59 in acc play. To news and notes Roanoke College mens team gets a first round bye in the odac tournament. They host a quarterfinal game on friday. In college wrestling. 5 ranked Virginia Tech beats 8 ranked michigan in the National Duals championship series. Former cowboys running back Joseph Randle arrested for the 5th time in 17 months. This time for aggravated battery, possession, and criminal damage to property. Three little words. One big highlight. Cut it out hawaii inbounds play with the perfectly crafted alley oop dunk thats what you call a rainbow dunk. The rainbow warriors beat uc irvine 7571. My constipation and belly pain. Feel like a raging storm. Ive tried laxatives. But my symptoms keep returning. My constipation. Feels like a heavy weight. That keeps coming back. Linzess can help. Oncedaily linzess treats adults with ibs with constipation or chronic constipation. Linzess helps you proactively manage your symptoms. It may help that are. Easier to pass and may relieve your belly pain. Do not give linzess to children under 6, and it should not be given to children 6 to 17. It may harm them. Dont take linzess if you have a bowel blockage. Get immediate help if you. Develop unusual or. Severe stomach pain. Especially with bloody or black stools. The most common side effect. If its severe, stop taking linzess and. Call your doctor right away. Other side effects include, gas, stomacharea pain. And swelling. Nbc nightly news is next. Well see you back here at eleven. Announcer from nbc news this is nbc nightly news with kate snow. Good evening. On a night when donald trump is still riding high off a big victory in South Carolina and jeb bush is out of the race, the question tonight, does trump have the republican nomination locked up, or can he, will he be stopped . And in the democratic race, a similar question. Is Hillary Clinton slowly making her way to the nomination with a win in nevada yesterday . We begin tonight with katy tur in atlanta, where trump held a rally today. Its beautiful, thank you. Reporter Donald Trumps grip on the nomination is getting tighter, and he knows it. To a crowd of more than 5,000 in atlanta. We won with everything, tall people, short people, fat people, skinny people. Just won. Reporter trump sweeping all of South Carolinas congressional districts, banking all of the states 50 del grats, despite marco rubios high profile endorsement and ted cruz 34 to cruzs 26 . Trump may have won, but it was a rocky week starting with him calling the last republican they lied. They said there were weapons of mass destruction. Reporter by thursday, smearing the pope as disgraceful. No leader, especially a religious leader should have the right to question another mans religion or faith. Reporter and on friday, in his last rally before the vote, recounting an internet myth praising mass killing by a u. S. General more than a century ago. And he took the 50 terrorists, and he took 50 men, and he dipped 50 bullets in pigs blood. Reporter exit polls showing that like in new hampshire, the majority of trumps voters decided on him months ago, meaning his myriad of controversies and outrageous statements just didnt matter. And nighter do his inconsistencies. On republican hot button issues like funding planned parenthood. Planned parenthood does a lot of good a really good job in a lot of different areas but not on abortion. Its doing the abortion. I am not going to fund it. Reporter and what he meant in a 2002 howard stern radio interview where he staid he supported the iraq invasion. Are you for invading iraq . Yeah, i guess so. Reporter today unable to clarify where he stood. I really dont even know what, because it was a long time ago and who knows what was inside my head. Reporter that same exit polling showed nearly half of South Carolina voters did not decide until the last minute and they mostly did not decide for donald trump. That means going forward, since the field is winnowing, hes going to have to gain not just maintain support. And if this crowd here in georgia is any indication, the campaign is comfort theyll be able to do that. Thanks so much. Among the democrats, new momentum for Hillary Clinton today after caucus voters in nevada decided to place their bets on her. Clintons victory over Bernie Sanders puts her in a stronger position going into the democratic primary in South Carolina next saturday. We get more on that tonight from kristen welker. Reporter Hillary Clinton is this a great night or what . Reporter after a decisive victory in critical nevada. Some may have doubted us, aboutbut we never doubted each other. Reporter to Bernie Sanders, the loss is a big blow, today courting africanamerican voters at a Baptist Church in South Carolina. Reporter and it was black wtehors largely delivered clpts victory, choosing her by a chopping 76 to 22 after she aggressively engaged them. And rallying with congressman jim clyburn and morgan freeman, who released a new ad today. Just like shes always stood with us. Reporter secretary clintons embrace of president obamas policies as well as her increasingly up close and personal style may have also propelled her, evident during the nsnbc telemundo town hall, i want to tell you i will end the three and tenyear bar provision so that you do not have to face that ever again. Reporter but there were also obstacles she must overcome. Latinos chose sanders by single digits, and Younger Voters picked the vermont voter by 72 . We will do well when young people, when working class people come out. Reporter today clinton celebrating her victory, but also questioning some polls, showing a sanders lead among latinos. Theres a lot of evidence we did very, very well with every group of voter. Reporter both candidates now looking forward to South Carolina, where clinton has a big lead and super tuesday when 12 states will be in play. If she wins big in South Carolina, as some people think she will do, then shes going to have tremendous momentum going into next weekend and the super tuesday states. So i think its just a real problem for Bernie Sanders. Reporter clinton is now on a twoday fundraising swing in california, and while sanders time last month, clinton has more than twice what sanders has on hand. Kate. Kristen lkerlker vegas. Thank you. When we come back, one little girls emotional plea for president obama. You totaled your brand new car. Nobodys hurt, but there will still be pain. It comes when your Insurance Company says theyll only pay three quarters of what it takes to replace it. What are you supposed to do . Drive three quarters of a car . Now if you had Liberty Mutual new car replacement, youd get your whole car back. I guess they dont want you driving around on three wheels. Smart. With Liberty Mutual new car replacement, well replace the full value of your car. See Car Insurance in a whole new light. Liberty mutual insurance. Constipated . Trust number one doctor recommended dulcolax use dulcolax tablets for gentle overnight relief suppositories for relief in minutes and stool softeners for comfortable relief of hard stools. Every day you read headlines about businesses being hacked and intellectual property being stolen. That is cybercrime test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test. He has a sharp wit. A winning smile. And no chance of getting an athletic scholarship. And that is why you invest. The best returns arent just measured in dollars. This is of course president obamas last year in office, a fact that has at least one of his supporters quite upset. 4yearold girls grandmother, caprina harris, explains that mr. Obama will no longer be the president. No i know. He can only serve two terms, and his term is up. No no its okay. Weve got to vote for pr m not ready. Huh . Im not ready for a new one. The video has had well over 2 million views on facebook. Even the president himself responded, saying, the girl should dry her tears because im not going anywhere and that once i leave the white house, ill be a citizen just like her, and when she grows up, she can get involved right alongside me. Speaking of the president , a pair of bald eagles who happened to be known as mr. President and the first lady are nesting a pair of eggs at the National Arboretum in washington, seen her on a 24hour eagle cam. Middle of next month. The eagles built their nest in 2014 and raised one eagle last year. These are the first bald eagles to nest in the National Arboretum in almost 70 years. And that will do it for nbc nightly news on this sunday. Lester holt will be here tomorrow. Im kate snow reporting from new york, and ill see you tomorrow on msnbc from nevada on the eve of the republican caucus. For all of us here at nbc news, what is going on . Why are they calling for crime scene tape . I felt helpless. I started crying and screaming because i knew it was my worst fear. A beloved couple found murdered. It definitely seemed to be personal. Their bodies found in their home along with a lifetime of curiosities. I remember seeing bayonets and cannonballs and all kinds of stuff. Was there any connection between the memorabilia and the murder . Did you ever wonder about that stuff there . It was time for police to start collecting suspects. Who was going to benefit by these two deaths . Jessica was the only child. The sole heir . The sole heir. Was there someone else who stood to gain . It was by far the most important piece of evidence in the clue that would reveal a mind blowing betrayal. I dont know how someone could have predicted this. But first, a very different kind of dateline mystery. One every family needs to see. She was a rare gem to have as a friend. And were lucky to have been with her. A bright and beautiful teen invites a friend to sleep over. The next morning, shes dead. Oh, my god, i dont feel a pulse. What in the world happened . How could this be . It turned out this was no ordinary slumber party. We know from their phones that this was a planned event. They had discussed it. Stories surfacing of a dangerous experiment. The main purpose of having this involvement was to try it. An experiment that just might tempt other teens. We know its entered our high school. Why the clues in this mystery could save a life in your