There must be at least eight disaster drills a year in a school. Drills must be held at different hours of the day or evening to avoid distinction between drills and actual disasters.
Mont. Code Ann. § 20-1-402
Number of disaster drills required -- time of drills to vary
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.