I’m having a few persons as contractors fixing my home. One is a Jew who might not be kosher. Can I offer him or the group money for lunch knowing that he might use it for non kosher food?
It is permitted or you to give the workers money and it isn’t lifnei iver. This is because the worker has the choice to buy either kosher or non-kosher food, your giving him the money is not causing him to buy non-kosher, as this is something that he will decide to do after you give him the money.