I have sole custody of an 8 year old child. My ex only has visitation rights of every other weekend and 2 one week periods during summer. On these one week visits are they allowed to leave the state? She informed me two days before leaving that they were going about 800 miles away. Ive been told that she needs my permission to cross state lines. I dont feel comfortable with her going that far away. I live in Oklahoma and would appreciate any help or info.