Someone in my house bought cut up veggies including onions from a non-kosher store. The person then made food in my milchig pot, and used plates and cutlery. As well, the dishes were then washed in my sink. Are my pots, cutlery and sink now trief?
Nowadays most stores are not cutting their vegetables with knives, but with food processors which are used exclusively for vegetables. Therefore we can assume that it was not cut with a trief knife and everything is fine.