. >>> hey, guys, welcome to "techknow", i'm phil torres, joined by marita davison, and kosta grammatis. marita, you met a man who spent years as a crime scene investigators for human victims. now he and his lad is taking on the fourth largest industry in the world, it's a tragic. >> yes, we think of forensics dealing with human victims, we don't think of it as a bird. it's a wildlife services add, taking on the illegal trade in endangered species problem. >> some lines are extinct. how big is the industry. >> in terms of economic value, a $19 billion industry. techknow had an inside look at the c.s.i. forensic lab. >> reporter: the world's animal kingdom is under siege. since 1970 animal populations declined on average by half, according to estimates by the world wildlife fund. a big driver is wildlife trafficking. illegal trade in wildlife is a big global business, worth at least $19 billion a year. that makes it the fourth largest criminal industry in the world. right behind drugs, counterfeiting and human trafficking. it's been connected to organised qaeda. >> the rhinoceros, one of

i'm phil torres, with marita davison, and dr it crystal dilworth.have seen the wonders of baseill. what comes up next. >> next i look at how baseill plants and talopia fish are living in harmony, and doing it indoors. >> reporter: for most of us these are the images that come to mind when we think of farms - rows of produce spanning to the horizon, farmers using machines to fertilise crops. at this warehouse farm outside of chicago, the rows go up, and fish do the work of fertilizing the produce. >> one, two, three, go. [ laughs ] they are hungry. that means they are healthy. >> reporter: paul is a cofounder of farmed here. >> imagine ponds with fish swimming in water and plants living around it. that's what we are trying to replicate indoors. it's a symbionic relationship between fish and plants, that's how we grow the crops >> reporter: the water from the tanks, and fish waste flows through filters, there, natural bacteria breaks the waste into nitrates, before the water is cycled to the plants. >> i try to have the most available plant foods on t

marita davison is specializes in ecology and evolution.onight, it looks like chicken, but it's not. the new meat substitute created from the lab gets the techknow taste test. >> that's our team. let's do some science. ♪ >> hey, guys, welcome to tarrant county techno teckhnow. you looked at designer drugs? >> specifically technologies that could be used by law enforcement or medical professionals to stay one stead ahead of chemists designing dangerous drugs for people who are in charge of illegal highs. let's take a look. >> methadrone, jwh, 18. >> an unfortunate right of passage of parents of teen aners is dealing with the discussion of illicit drugs. >> 2 cb. >> but now a pharmachopia would be more helpful. >> there is a cat and mouse game chemists. >> they are catching on and catch cashing in. they are finding their way to the united states military because unlike using pot, cocaine, or crystal meth, these synthetic drugs will not show up on standard drug tests. >> these things are designed to be attractive, particularly to children. the

marita davison is