natasha ghoneim explains why the pressure is on to take man-made marijuana off the streets. >> synthetic drugs have been a staple of the clubbing scene for years in cities like miami. the most popular are known as k-2 or spice and bath salts. the amphetamine like drugs are mostly made in asia and often sold legally in stores in packets like this, as herbal incense or potpourri. >> patients come in combative, psychotic, hard to control. many times they have to be intubated or put on life support to control them. >> according to a federal government report, between 2010 and 2011, visits to emergency rooms due to synthetic drug complications, more than doubled, to 28,500. one of these so-called designer drugs-- synthetic marijuana-- is popular among young people. according to a university of michigan study, 1 in 9 high school seniors used it in 2012, putting it just below marijuana and hashish in popularity. dr. randy katz is an e-r director at regional memorial hospital in hollywood, florida. he says the danger of these synthetic drugs is that no one knows exactly how the combination of co

natasha ghoneim is there with more. >> reporter: i'm stopping on a major road on miami-beach.uring high tide the area is a mess. it's not uncommon for me to be up to my shins. they are installing the drainage pipes, pump stations and elevating the street to alleviate flooding. one geologist we spoke to says these efforts are for nought. we spoke to geologist at the university of miami and said we are living on borrowed time. it's not a matter of if south florida will be uninhabitable, it's a matter of when. miami and miami beach were built on limestone and sand. they are porous, making it easier for sea water to rise up. by some estimates as early as 2048, there could be a 2 foot sea level rise. that's right here, along the construction cone, which means flooding will be more persistent. to put it into perspective the professor says it's a mortgage cycle away. >>> that's goep natasha ghoneim ror k in miami. and rising sea levels are a concern for coastal communities. jacob ward is in san francisco with more. >> reporter: well, it's extraordinary how many people rising sea leve

natasha ghoneim, live from miami beach. great report. >>> norton antivirus software - beware, the company behind the software says it no longer works. >>> plus the new campaign ad - one of the most memorable. we'll show it to you and get an update on the primary elections. power politics is next. >>> if today's power politics, this is a primary election day in indiana, ohio, and north carolina. north carolina has several challengers, between the conservatives and tea party. tom til us is favoured, endorsed by business groups and tax, including one run by karl rove, but faces a challenge from greg brannon, an op stet rirn, backed by the tea party, and favourite kentucky senator rand paul. if no candidate clears 40% there'll be a run-off in july. established republicans hate the idea of waiting two months before putting resources to kay hagan, a vulnerable democrat seeking election. in order for the g.o.p. to pick up the net six seats needed to take control of the senate a republican has to be hagan in north carolina. in the

natasha ghoneim explains. >> reporter: the avocado has been called a super food. it's level enjoyed as guacamole. first served by the aztecs of mexico. >> it's a compliment of a meal. >>> you may call pammela micheo a guacamole ofission ardo, she has made it for the last three years, and people recognise her recipe. >> a lot of people tell me that my guacamole is really good. from the plate of guacamole, and tore tea chips to the commercial groves of south florida, it is just an hour's drive. here burn stops sit like grave stones of trees. it's called laurel wilt and spread by ambroshia beetle, and is the first victim. the fungus destroyed about 50 trees. they might fight the fungus but die. >> it does a good job, it end up killing itself. >> it kills trees in 2-6 woks. the disease is opportunistic. avocado tree roots connect to each other. to the fungus wan march through the grove. there's no cure. professor jonathan crane with the university of the florida, institute of food and agricultural science says no one should panic, scientists are researching ways to de

natasha ghoneim has the story. >> reporter: the new patient in an orlando hospital is a healthcare workerm saudi arabia, who may have exposed more than 500 passengers while heading to florida. cdc officials say the patient felt sick when boarding the first flight. >> this virus can get on a plane and travel around the world wherever it wants. the right person gets infected, doesn't know it, and lands anywhere around the world. >> reporter: the cdc has spent 1,000 man-hours trying to track down the passengers on the american fights. mers was first detected in saudi arabia in 2012. since then 538 cases have been identified across the globe. of those cases 145 people have died. saudi arabia is the epicenter of mers, where most cases and deaths have occurred. health officials say you can't get the virus by casual contact. it is spread by having close contact with an infected person, such as caring a person with it. 27% of people who get mers will likely die. there is no vaccine or specific treatment recommended. but researches hope they are closer to creating a vaccine. >> we're several steps

natasha ghoneim tells us why the pressure is on to take them off the streets. >> synthetic drugs have been a staple of the clubbing scene. the most popular are k2, spice and bath salts. the amphetamine drugs are made in asia, sold in stores, in packetslike that, as herbal incense or pop peri. >> patients come in psychotic, difficult to control, have to be intubated and put on life support to control them. >> according to a federal government report, between 2010 and 2011 visits to emergency rooms due to synthetic drug combinations doubled to 28,500. one of the so-called designer drugs, synthetic marijuana is popular among young people. according to a university of michigan study one in nine high school seniors used it in 2012, putting it below marijuana. dr randy katz is the e.r. director at regional memorial hospital in hollywood florida, and he says the danger is no one knows how the combination of compound cooked in a lap will affect the body. on top of that. each time a product is banned, the makers modify the recipe, change the fame and back on the market it goes. >> the drugs ar