Therefore, they develop their own standards, which allow only the strictest of all allowable substances. Guests must be respectful and observe the strictest decorum. UK has some of the strictest Key disclosure laws of the western world. Preparations were taken in the strictest secrecy. Houston agreed, provided the operation be conducted under the strictest secrecy. It was one of the strictest such laws in Canada. Early Ming dynasty saw the strictest sumptuary laws in Chinese history. In 2012, Costa Rica passed one of the strictest smoking regulations in the world. This legislation is widely regarded as the strictest in the world. UK animal testing legislation is regarded as the strictest in the world. Reagan National Airport has some of the strictest noise restrictions in the country. Parking on the autobahn is prohibited in the strictest terms outside these designated areas. An ideal of the strictest professionalism was instilled in them from the beginning. Cumberland preserved the strictest discipline in his camp. Gandhi claimed that only "clear vision, iron will and the strictest discipline" can remove poverty.