I interviewed for a medical device company a few years back, I signed an NDA for it, they showed me some cool technology they were working on, I got to take a t

I interviewed for a medical device company a few years back, I signed an NDA for it, they showed me some cool technology they were working on, I got to take a tour around the place, and actually see what was being developed, how their processes work, and how far along they are on certain things. How they design, and fab up their products. Companies that make you sign NDA's are really just protecting their back. How do they know I wasn't actually working for some rival company, and just got their interview to see what was going on. If that was the case, an NDA gives them a bit more leverage in court. If it was just some random joe like myself, no big deal. Corporate espionage probably does happen. (I say probably, as I can't say i've ever witnessed it though.)