Guideline 6 Do not hand in a paper which is the same or similar to one you have handed in elsewhere, unless you have the permission of both professors in advance. It is dishonest to claim course credit more than once for the same work. In addition, it deprives you of the opportunity of researching and gaining knowledge on different topics, one of the aims of a college education. It is an excellent idea to ask someone to criticize a completed paper before you submit it, and to bring to your attention errors in logic, grammar, punctuation, spelling, and expression. However, it is not permissible to have another person re-write any portion of your paper.
ANY paper can benefit from the comments of another reader before the work is submitted.
Nevertheless, you should ensure that this process of critical review does not go beyond generally-acceptable limits to the point where an unacknowledged individual makes a significant contribution to your work.