I am already earning my criminology & security degree from National Open University OF Nigeria. Can I transfer to an online university in the US? Also after reading law in your university can I practice in Nigeria?
- answers

Yes. Many US colleges and universities do accept international students. For more information on this subject, please see this articles - International Students: How to Go To College in the U.S..
Because you would be earning your degree from a foreign university, you would need to attend an additional one year at an Nigeria Law School. For more information on practicing law in Nigeria, contact the Nigeria Bar Association - they will have the specific information that you will need.- related questions
What kind of jobs can I apply for with a bachelors degree in rehabilitation?
What is needed to be an online teacher?
Can I study in this university if I live in USA even if I do not have any legal status I am from Guatemala and I did study high school over there?
Are there distance education classes that I can take for credit hours?