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what surprised me is voices urging caution are not only getting louder, but they're getting more prominent. >> all right. i'm on my way. >> if you've ever put a cell phone to your ear, you should listen to what neurosurgeon dr. keith black has to say. >> there's no way to say that cell phone use is safe. i think the public has a right to know there could be a potential risk. the public generally assumes that if one is selling something on the market, that we have had assurances that that device is safe. >> to be clear, dr. black's message is at odds with headlines from the largest in...

These are natural scans of the brain looking at what's known as glucose metabolism. one way of measuring brain activity. this is with the cell phone on. look at the yellow around the brain compared to when the cell phone is off, very little yellow comparatively speaking. it shows there's an impact from using cell phones actually on the brain. we don't know if it's good or bad right now. these are preliminary findings. there may be concerns among people who already have some sort of brain problem. for example, someone has a brain tumor you can see increased glucose metabolism because cancer is ...

Speaking. this is one of the first studies to show there is an impact from using cell phones actually on the brain. we don't know if it's good or bad right now. these are preliminary findings. there may be concerns, for example, among people who already have some sort of brain problem. for example, if someone has a brain tumor, you can see increased glucose metabolism, because the cancer is a high activity part of the brain, could that worsen it? that's questions that researchers have raised. they say they're committed to studying it further. it all comes back to a question of safety. i should...

paraplegics. this guy could stand up again. this is when an accident paralyzed five years ago and doctors said he would never walk again. a medical team implanted an electric stimulator and within months he was taking assisted steps on a treadmill. i'll be back at the top of the hour with more live news here. >> i'm dr. sanjay gupta. welcome to the show. today i'm taking a closer look at something that's become so closely woven into our lives it's hard to imagine what we would do without it. i'm talking about our cell phones. most of us take it for granted that they're safe and that ...

surgery. police in mexico arrested the leader of one of the country's most notorious drug reasons. balderas operated the gang. i talked to a former dea agent a short time ago. >> this is major. you've got to remember this gang was responsible for large shipments over a long period of time, over ten years, coming from mexico to united states. you're talking about cocaine, marijuana. also, because they were able to free up the borders and get control over the borders, there is methamphetamine and heroin that crossed the borders as well. >> barragan was wanted in the united states. th...