Can a 17 year old visit somebody in jail if their going with someone 18?

Yes, a 17-year-old can typically visit someone in jail if they're accompanied by an adult, such as an 18-year-old. However, policies may vary depending on the specific jail or correctional facility, so it's essential to check the visitation rules of that facility beforehand. Additionally, the adult accompanying the minor may need to provide identification and possibly be approved as a visitor.