I have learned that one can store information in Dropbox if one does not wish to sync up the devices. Students can use the app for learning at their leisure. For example, they could download the app for homework or just to become familiar with the topic. The next day the teacher could have a quiz over the basic information.
I already have a paper I have the students read and sign for proper use of technology. I may change a bit of the wording to incorporate the iPad.