Full length swat shields? What a clever sounding idiotic idea.

Even if you STOP the .50 cal bullet with your shield you still have to deal with the kinetic energy of the bullet. One hit and the officer would be down with multiple fractures, not to mention it'd probably knock them back into last week. Those swat shields aren't there to stop bullets so much as they are to stop cans, and sticks and baseball bats. Things with not near the kinetic energy of a .50 cal bullet. Using this material to make a swat shield would be overkill, expensive and fairly useless.