Jho Low is trying his best to prevent this book (plus another book) from being available in bookstores: http://www.sarawakreport.org/2018/08/jho-low-moves-to-block-books-on-1mdb-exclusive/
No. Either the government does not know where he is. Or he is in a country which doesn't have an extradition treaty with Malaysia. His Malaysian passport has been cancelled by the government, but it is assumed that he has a passport of another country.So he's not in custody for now?