Sure. In the form that your users use, just include criteria in the query
to pull only records where that checkbox is not selected.
If you want to get really fancy, then you could look at who is logged on and
hide the records if there is not a supervisor logged on, or show all records
if there is a supervisor logged on.
Without knowing more about your current security (how do you know it is a
supervisor) or where you want to hide them (form, report, query?) it would
be hard to give you a more detailed answer.