Is it illegal to have bulletproof windows?

In the United States, it is generally legal for private citizens and business owners to install bulletproof windows in their homes, offices, or vehicles. There are no federal laws prohibiting the ownership or installation of ballistic-resistant glass. In fact, many high-risk businesses like jewelry stores, pawn shops, and banks are often required by their insurance companies to have such protection. However, while the glass itself is legal, there may be local building codes or Homeowners Association (HOA) rules regarding the appearance and installation of windows. For best results, the question should be evaluated in the context of the building type, the expected use, and whether the goal is protection, containment, or delay.