NEW YORK, Dec. 23 (Xinhua) -- More than 100 million U.S. dollars has been spent for the purchase and installation of window film at U.S. school districts nationwide -- the film is attractive to school officials because it is a fraction of the cost of bulletproof glass. However, it always doesn't work, reported The Wall Street Journal (WSJ) on Monday.
"The largest U.S. manufacturers of window film, including 3M, say it can't stop bullets or intruders. But that hasn't stopped some window-film dealers from cashing in on false or exaggerated claims of ballistic protection," noted the report.
