the dazer laser's capable of blocking your vision entirely. >> it isn't meant to replace guns or pepper spray, intended to give law enforcement more options. >> if they can take out the vision, take down the criminals, do it less violently, safer, and more effectively. >> reporter: he says there are plenty of other applications for the device. >> it can be used for air marsha marshals, in applications of the military, in applications that would even be for park rangers, animal control. it can be used for riots, crowd control, security applications. >> the makers say the technology they use is safe and effective from just a few feet away to over a mile away. and they say it doesn't cause any permanent damage to the eye. dazer lasers could be in the hands of our u.s. law enforcement agencies soon. gary tuchman, cnn. because of one word,