I have to admit that when I first came to the Writing Center at Clemson University and was told that we weren't allowed to write on students' papers; I was shocked. This was the way that we always did it at my previous university. However, after employing the practice and also the practice of letting the student read their paper aloud, I found that these practices were much more affective. Peter Carino argues in his essay, "Power and Authority in Peer Tutoring," that because centers have a preoccupation with non-directive tutoring they can become unethical. Carino assumes that because these practices are employed to give power back to the student, it takes away all the power of the tutor. This is just as much a fallacy as stating that there's no power relationship present in the writing center. Let's explore the first practice that my WC uses: We aren't allowed to write on a student's paper. Now this policy was probably first employed to protect tutors from allegations of plagiarism. What's important to note is that this practice was a reaction against other's misconception about what we do in the WC and not a reflection of how we view it.
However, this is not to say that the policy isn't a good one for other reasons. First of all, it does put the students in control of their papers, as well they should be. It's their papers!!! Not ours. We exert our power because we have in our possession rules about grammar and punctuation and, what I like to call, the big book of examples--ways you "could" approach this or that. Furthermore, why does Carino think students take notes in lectures? Because, if students don't interpret they would retain, i.e. putting it in your own words. This is the same situation in the writing center. Students need to write in their own words what they "interpret" from what we say. What's truly "unethical" is not being able to see concretely that they understand your comments and sending the student away with your foreign handwriting sprinkled all over their pages assuming that they can decipher your letter or that they even speak your language.