When someone buys a product with Kosher certification, do they have to check to make sure that it is still certified Kosher or can they rely on the fact that the last time (or first time) they bought ...
Inspired by this comment, there are Chazaka's (presumptions) and principles of נאמנות (trustworthiness) in Halacha that no longer hold in our practical experience. One example is עד אחד נאמנן ...
There are many halachic chazakas. Most of them are halachic assumptions, such as: Keeping things the way they always were - Either financial (Chezkas Marei Kama) or religious (Chezkas Tahara, ...
Say I visit a bakery, restaurant, jail, hospital, or nursing home. And say I already know that the food there is kosher. Must I still check the kashrut certificate every time I visit? (Gershon ...