United States Code Title 36, Chapter 10, Patriotic Customs:
1. The flag may be displayed 24 hours a day if weatherproof and properly illuminated during the hours of darkness.
2. The flag should never be used as wearing apparel, bedding, or drapery.
3. The flag, when it is in such condition that it is no longer a fitting emblem for display, should be destroyed in a dignified way, preferably by burning.
4. The flag should never be displayed with the union down, except as a signal of dire distress in instances of extreme danger to life or property.
5. The flag should never touch anything beneath it, such as the ground, the floor, water, or merchandise.
